AVE6321487:
United States, 1940s: Rows of glass jars on a conveyer belt move through a machine that fills each jar with cottage cheese, then caps the jars / Bridgeman Images
AVE6321494:
United States, 1940s: A factory worker rinses a large metal bolt under a faucet, then a shot of a factory worker scrubbing a smaller bolt with a handheld brush / Bridgeman Images