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Circa 1927 - in this silent war film, us army air service pilots signal to each other before taking off from an airfield, while german bombers fly.
CIRCA 1930 - Sheet silver is stamped, annealed, cross-rolled, graded, outlined and cut into a spoon in a factory.
CIRCA - 1930 - Sheet silver is stamped, annealed, cross-rolled, graded, outlined and cut into a spoon in a factory.
CIRCA 1920 - A mould is put into a wheel press and a grinding wheel is made in an aloxite plant in Ontario, Canada.
CIRCA 1920s - Carborundum and Aloxite wheels are made through the pressing process at the plant in Niagara Falls, Ontario.
CIRCA 1920 - Freshly blended tea from Ceylon, Sri Lanka is machine packed at a factory.
CIRCA 1930s - Assembly lines, skilled craftsmen, enginers and laborers are hard at work in the opening scenes of a Chevrolet Motor Company industrial film from 1936.

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CIRCA 1930 - Shet silver is stamped, annealed, cross-rolled, graded, outlined and cut into a spoon in a factory.

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