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CIRCA 1930s - A chemical plant produces ammonia for industries, in Belle, West Virginia, in 1936.
CIRCA 1943 - The engine of an F6F Hellcat undergoes many last-minute tests before flight.
CIRCA 1950s - A 1950s US Navy training film on how to maintain your aircraft
CIRCA 1943 - Once airborne, a Navy pilot demonstrates how to safely guide an F6F Hellcat to full throttle altitude.
CIRCA 1930s - Train cars travel near a factory which is producing large amounts of smoke.
CIRCA 1940s - Milk is bottled on an assembly line at a plant in the 1940s.
CIRCA 1950s - Student Army divers and their instructor enter a recompression chamber and a tin can collapses as the pressures changes inside, at Fort Eustis, Virginia, in 1954.

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CIRCA 1930s - A chemical plant produces ammonia for industries, in Belle, West Virginia, in 1936.

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