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	Perforated sheets - Wikipedia, the free encyclopedia
		The method of perforated sheets was a cryptological technique used to decrypt ciphers produced using German Enigma machines (see Cryptanalysis of the Enigma).
		The "perforated sheets" were invented in late 1938 in Poland by Henryk Zygalski, and accordingly are sometimes known as Zygalski sheets.
		The perforated sheets were subsequently produced at Bletchley Park, in England, by John Jeffreys.
	en.wikipedia.org /wiki/Perforated_sheets (273 words)

	Perforated Metals Factory (Site not responding. Last check: 2007-10-14)
		This perforation is an exceptional use so perforators haven’t much standard tools of this kind.
		Perforated plates in stainless steel – mild steel- aluminium copper, brass, plastic etc..
		Perforated plates in stainless steel aluminium, copper and brass.
	actis.nelweb.biz /perforatedmetalplates.htm (205 words)

	GBS lamiere perforate, perforated sheets, chapas perforadas - homepage perforated sheets
		Perforated sheets for the mechanical, chemical, food, textile, drinks and pharmaceutical industries...
		We produce perforated sheets with round, oblong and flared holes, micro-perforated and embossed sheets in s/steel Aisi 304-316-321, mild steel (Fe), galvanized, aluminium, copper, brass and plastic materials.
		Perforated sheets sizes range from 2x1m., 3x1m., up to 3x2 meters, further we can provide sheets to measure, perforated in zones, as drawing, as sectors or as trunk of cone, according most of customer's needs.
	www.gbsperforate.it /ukhome.html (200 words)

	ENGLISH - Online Information article about ENGLISH
		One Penny Stamp.First issue, 1st (for 6th) May 1840: the head executed by Frederick Heath, from a drawing by Henry Corbould of William Wyon's medal struck to commemorate her majesty's visit to the City of London on the 9th of November 1837: size 2211 mm.
		These stamps are distinguished from the stamps already described by the absence of plate-numbers and (except in the penny stamp) of check-letters in the corners; also by the coarser style of engraving necessary for printing by machines driven by steam-power.
		One Pound.March 1, 1877: watermark shamrock; brown-purple ; perforated 14.
	encyclopedia.jrank.org /EMS_EUD/ENGLISH.html (2007 words)

	Perforated sheets-Imar S.A (Site not responding. Last check: 2007-10-14)
		REPUBLICA OF CHILE Perforated sheets, republic whose territory extends by the west and southwest of South America; it limits the north with Peru, the northeast with Bolivia, the east with Argentina and the south and the west with the Pacific Ocean.
		The mountain range of the $andes is wider in the northern region Perforated sheets, in where are ample bulks and numerous mountains with altitudes superior to the 6,000 meters.
		Characteristics of the population The population of Chile (according to estimations for 1998) was of 14 Perforated sheets, 787,781 inhabitants, with a density near the 20 hab/km².
	www.imarsa.com /Perforated/Perforated_sheets.htm (2189 words)

	Perforated Metal
		Slotted Perforations: The long dimension of the slots can be furnished with either the width or length of the sheet in most cases.
		Sheets and Plates Re-sheared after Perforating: Special margins are available to specifications but they must carry a tolerance within the limits of the perforating tool.
		The rule of thumb for perforating is that the hole diameter should not be less than the thickness of the material.
	www.marcospecialtysteel.com /perforatedmetal.htm (642 words)

	Perforated Sheets (Site not responding. Last check: 2007-10-14)
		Actis Furio is a specialized firm in manufacturing perforated steel plates.
		Perforated Sheets with alternate round holes at 45°, 60° and 90°
		Perforated stell manufacturing is realized in accordance with modern methods suitable to meet all our customers’ requirements.
	actis.nelweb.biz /perforatedsheets.htm (104 words)

	Perforated Sheets - ActisFurio.com
		This kind disposition (also said quinconce-portion) is the most common, since it combines high rigidity of the sheet with a pretty good ratio of empty on full.
		In Standard size sheets with commerciai sews round holes the perforation direction is usually aligned with the longer edge of the sheer_ The reverse dlsposition must be specifically required.
		Generally, standard SHEETS with a maximum thickness of 3 mm have minimal full edges just on the longer sides, while from 4 mm up, there are full edges also on the other sides.
	www.actisfurio.com /category.aspx?cat=lamiere_perforate&lang=eng (350 words)

	The Kharkov Frunze Plant :: Perforated Sheets
		The power of metal and freedom of space are harmoniously combined in perforated metal sheets of the Kharkov Frunze Plant.
		Perforated sheets are the indispensable constructional element in machinery, aircraft construction, instrument-making industry and other branches.
		Great opportunities for realization of ideas with perforated stainless, cold-rolled, galvanized steel and also aluminum, brass and F plastic are provided for constructors, architects and designers.
	www.perfo.ru /eng/production/perforation.html (124 words)

	Elastic Properties of Perforated Metals (Site not responding. Last check: 2007-10-14)
		The ratio of the effective elastic modulus of the perforated material, E, to the elastic modulus of the unperforated material, E, and the effective Poisson's Ratio, v, are given.
		As applied herein, the equivalent stiffness of the perforated material is used in place of the stiffness of the solid material.
		By evaluating the effect of the perforations, the equivalent effective elastic modulus of the perforated material, E, is obtained as a function of the elastic modulus of the solid or unperforated material, E. In addition, the effective Poisson's Ratio, v, of the perforated material is obtained.
	www.iperf.org /elastic.htm (368 words)

	Perforated sheets (Site not responding. Last check: 2007-10-14)
		The method of perforated sheets was a codebreaking technique used against the Enigma machine (see Cryptanalysis of the Enigma).
		The method involved superimposing a series of sheets — each containing a grid of holes in various positions — and shining a lamp underneath; a large number of possibilities for the secret Enigma settings could be eliminated using this approach.
		It was first developed in 1938 in Poland by Henryk Zygalski, and accordingly is sometimes known as Zygalski sheets.
	pedia.newsfilter.co.uk /wikipedia/p/pe/perforated_sheets.html (141 words)

	Perforated Product - Diamond Manufacturing - Perforated (Site not responding. Last check: 2007-10-14)
		The most common form of perforated material because of its versatility and ease in handling, perforated sheets can be supplied either as flat, fabricated, and/or finished product.
		Typically produced from coil, perforated sheets can be produced in widths up to 60" and in any length (typically under 250" for shipping purposes).
		Supplied either fully perforated or as paneled sections either with or without precisely placed locator holes, perforated coil up to 60" wide can be produced in 16 gauge and thinner material to meet your design and production requirements.
	www.diamondman.com /prod.htm (153 words)

	Perforated Paper, Tickets, Coupons, Certificates, Labels and Forms - Stub Perfing
		Perforated paper, or preperforated paper, is a sheet of paper that has "perforation" lines of very small holes (micro) punched into the paper.
		This allows the various parts of the perforated paper to be separated from one another by simply "folding and tearing along the dotted line." We also offer stub perfing.
		If you need perforated tickets, raffle tickets, coupons, gift certificates, lables, or business forms, and want to print on your own printer, we have the software and perforated ticket stock to help you achieve your goal.
	www.perforatedpaper.com (419 words)

	Metals Inc. - Perforated Metal/General Info
		The condition which occurs with some specifications of staggered pattern perforations as a result of tool design, where the pattern is completed on both ends of the plate.
		The long dimension of the slots can be furnished parallel with either the width or length of the sheet in most cases.
		In the majority of requirements, Perforated Sheets or Plates can be furnished to AISI flattness tolerances.
	www.metals-inc.com /prperfgn.htm (415 words)

	manufacturer of perforated sheets,exporter of perforated sheets,metal perforated sheets exporters,India (Site not responding. Last check: 2007-10-14)
		Manufacturer and Exporters of Perforated Sheets in All Kinds of Metal such as Mild Steel, Stainless Steel, Aluminum, Brass, Copper etc.
		We are leading manufacturers of Perforated Sheets in all kinds of metal such as Mild Steel, Stainless Steel, Aluminum, Brass, Copper etc.
		Manufacturers of Perforated Sheets in all Metals (MS / SS / ALUM / BRASS / COPPER ETC) The Dia ranging from 0.9 mm ø to 100 mm ø thickness ranging from 0.3 to 10 mm thick perforation sheets are made in square of long hexagonal and other designs.
	www.tradeget.com /southern (197 words)

	Acoustical Uses for Perforated Metals (Site not responding. Last check: 2007-10-14)
		We have illustrated by the preceding examples that, generally speaking, perforated sheets with small holes close together give the greatest transparency; but for practical reasons, very tiny holes should be avoided because they may get clogged with dust or filled with paint when the sheet is repainted.
		Perhaps more important, very finely perforated sheets tend to be fragile and are much more expensive to manufacture.
		At this point, large-scale users of perforated metals are probably reaching for their hand-held calculators to find out the values of TI for their most popular products.
	www.iperf.org /ac20.htm (350 words)

	LEGAL PADS (Site not responding. Last check: 2007-10-14)
		Perforated legal ruled pads, 50 sheets per pad, pack 12, 8.5 X 11.75, white
		Perforated legal ruled pads, 50 sheets per pad, pack 12, 8.5 X 14, white
		Perforated legal ruled pads, 50 sheets per pad, pack 12, 5 X 8, white
	www.ultimatetoner.com /legal_pads.htm (1364 words)

	PLASTER-WORK - LoveToKnow Article on PLASTER-WORK (Site not responding. Last check: 2007-10-14)
		Walls liable to damp are sometimes battened and lathed in order to form an air cavity between the damp wall and the plastering.
		Lathing of metal, either of wire or in the form of perforated sheets, is now extensively used on account of its fire-proof and lasting quality.
		and burying many of its numerous islands and marginal swamps under a vast sheet of water, and obliterating its many parallel lateral channels and intricate systems of connecting canals.
	19.1911encyclopedia.org /P/PL/PLASTER_WORK.htm (5125 words)

	RK Udyog - Product Range - Perforated Sheets
		Years of proven performance is your guarantee of skilled workmanship.
		Sheets are perfectly flat and straight, have parallel sides and have buckle and camber removed.
		Round holes, in patterns with staggered centers or straight centers; in sheets, plates or coils - we do it all.
	www.rkudyog.com /perforated.html (152 words)

	Perforated sheets on stock - RMIG
		With manufacturing units and sales offices throughout Europe and several thousand sheets on stock, RMIG can offer a unique service within production and delivery of perforated sheets.
		A very large part of our stock sheets are available for immediate delivery.
		To see the correct delivery time please choose the stock list of the RMIG unit from which the sheets are to be delivered and invoiced.
	www.rmig.com /sw1426.asp (117 words)

	UNALLOY-IWRC (Perforated Metals-Specifications)
		Perforated material with special margins to your requirements can be supplied.
		Spacing for large perforations will be designated by either Centres of Perforations, or by the Open Area required.
		Spacing for small perforations will be designated by either Centres, or Open Area, or if more practical, by the Number of Perforations to the square inch.
	www.unalloy-iwrc.com /perf/specperf.htm (362 words)

	Perforated Sheets by Actis Furio (Site not responding. Last check: 2007-10-14)
		Actis Furio Srl has been operating for 40 years both on the national and international market in the field of metal plate perforation.
		Actis Furio was established in the north of Milan just before the Second War World providing perforated stainless steel, nets and metallic wire cloths for metallurgical and mechanic industry.
		This catalogue would like to support those who are using drilled sheets, and we hope our end user will appreciate it.
	www.tuttoaziende.com /ospiti/actis (207 words)

	Perforated Sheets - Perforated Sheets supplier,Perforated Sheets exporter,Perforated Sheets suppliers & exporters (Site not responding. Last check: 2007-10-14)
		We can also provide perforated sheets in various different shapes from 0.8mmthk to 2.0mmthk in size upto 4 feet x 10 feet on hairline & No.8 surface as per your requirement.
		Sealing sheet with perforated 0.1mm SS316 inserted 2.
		Sealing sheet with perforated 0.2-0.25mm ordinary carbon steel inserted 4.
	www.stallone.trade-india.com /TradeLeads/sell/Industrial_Supplies/Perforated_Sheets (348 words)

	1922-29 Issue
		In 1934, twelve years after the stamp was issued, a block of eight of the 25c was discovered with one vertical row of perforations gauge 10 and all other sides gauge 11.
		Prior to the discovery of this unique multiple, it was thought that Perf 10 at Top or Bottom varieties on the earlier 1917 Issue were somehow caused during the Bureau’s transition from Perf 10 to 11.
		The error occurs on the side of the 25c stamp, which is produced in a horizontal format, and on either top or bottom of four additional values from the set: the 2c, 4c, 5c, and 10c.
	siegelauctions.com /enc/1922.htm (353 words)

	Perforated metal manufacturers of metal and filter screens, expanded metal, perforated metal sheets, and perforated ... (Site not responding. Last check: 2007-10-14)
		Perforated metal manufacturers of metal and filter screens, expanded metal, perforated metal sheets, and perforated tubes.
		Perforated metals manufacturers including expanded metals, filter screens, perforated metal sheets, metal screens, perforated metal panels, and perforated tubes.
		Perforated metals are made with various hole patterns and shapes.
	www.perforated-metals.com (497 words)

	Perforated Sheets, Perforated Sheets Manufacturers Suppliers Exporters
		Manufacturers & exporters of Perforated Sheets / screens in all metals for separation, filtration, sugar, chemical, accoustics, interior decorations and grading.
		Exporters of all kinds of cold rolled Sheets and strips,galvanized and pre-coated steel Sheets, Perforated Sheets and steel shafts.
		Manufacturer and exporters of steel metal wires, stainless steel Perforated Sheets and coils, stainless steel strips and shims.
	www.indianindustry.com /metalproducts/8226.html (1093 words)

	Perforated Plastic
		Ametco now stocks 23 standard plastic perforated sheets in inventory and ready-to-ship.
		Stock sheets range from 1/16" to 1/4" thick, and come in configurations ranging from 10% open air to 48% open air.
		Perforated Plastic is ideally suited to many of the same applications as perforated metal; however, it is lighter and is more corrosive resistant.
	www.ametco.com /perfplastic/index.html (102 words)

	Testatika Free energy machine demonstration from The Encyclopedia of free energy,energy21.org,energy 21 org Geoff Egel
		The lower side of the arm is covered with perforated aluminum sheets (square holes), while the bottom of the plates is covered with brass wire mesh.
		There is a number of plexiglass blocks with glued-on perforated sheet, their function is unknown.
		Some have perforated sheets glued on two opposite sides, so they could be condensers; others have only one perforated sheet which is bent over an edge of the plexiglass block, so it covers two adjacent sides.
	energy21.freeservers.com /report99.htm (1571 words)

	Decorative Metal Stampings, Perforated Aluminum Sheet, Perforator Stainless Steel
		Accurate Perforating designs, produces, and fabricates material covers, speaker grills, guards, sunscreens, door, wall and ceiling panels that are beautiful decorative metal as well as functional.
		Accurate Perforating offers decorative perforated metal including perforated aluminum sheets, sheet metal, stainless steel, perforated aluminum, plastic, speaker grills, expanded metal and more that is ideally suited for a wide range of architectural design applications.
		Many customers use decorative metal to make cabinets, wineries, furniture, etc. These perforated products including perforated aluminum sheets, sheet metal, stainless steel, perforated aluminum, plastic, speaker grills, expanded metal and more are widely used in a number of industries.
	www.accurateperforating.com (203 words)

	Perforated Metal, Perforated Metals - Thomas Register EZ Directory of Manufacturers
		The manufacturers and distributors featured in our extensive directory offer a wide variety of perforated metal screens and gratings, in all standard and custom shapes and sizes.
		Wide variety of large & small perforation patterns available in steel, aluminum, brass, bronze, nickel, wire & wire cloth, stainless, most alloys, & formica.
		Metal screens perforated in a variety of hole sizes, shapes & spacing, round, square, slotted & specials to meet customer requirements.
	www.thomasregisterdirectory.com /perforated_metals/index.html (1072 words)

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