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| | Rubber |
 | | Rubber is a natural polymer, obtained by collecting and processing the sap of the hevea brasiliensis, a tree common to tropical areas. |
 | | The combination of calendaring (reinforcing rubber with a textile product, developed by the l820's and l830's) and vulcanization led to the development of improved boots and rainwear, and the appearance of new industrial products such as hose, belts, insulation, and sundries such as balloons, surgical and dental products. |
 | | By the turn-of-the century, rubber boots, raincoats, hoses, balloons and even tires had become familiar features of American life, and the rubber industry was rapidly assuming its twentieth century form. |
| gozips.uakron.edu /~nelson/rub2.htm (766 words) |
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