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Tractors play a major role in mining and cultivating salt in the 1920s, at a salt field. (1920s)
1930s: Coffee beans are pulped and washed before being laid out to dry, as demonstrated in these scenes from a 1930s film about the Hills Bros Coffee Company.
Construction of roads and test site structures at Enewetak Atolls in the Pacific Ocean for Operation Sandstone, 1947. (1940s)
CIRCA 1931 - Raw materials are mined and transported by train and ship.
Silent 1920s era science film showing what happens when air is pumped and put under pressure.
CIRCA 1920s - Silent 1920s era science film showing what happens when air is pumped and put under pressure.
CIRCA 1940s - The usefulness of portable emergency phone equipment is demonstrated in 1948.

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CIRCA 1920s - Tractors play a major role in mining and cultivating salt in the 1920s, at a salt field.

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