Image: VulcanizationMold1941
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Description: Worker operating an automatic vulcanization mold at Firestone (General) Tires, Akron, Ohio. The mold is closed by pushing a button, which starts several operations. First the airbag is filled with live steam which circulates during the entire process; next an automatic timer sets itself for the proper length of time and temperature; next pressure is exerted to squeeze the tire into the mold pattern.
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