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Circa 1970 - scientists develop a hydraulic system to recycle chicken manure into fertilizer and other resources.
CIRCA 1930s - Peas pass through a quality grater, a brine bath, a hopper and a blancher, in a cannery, in Illinois, in 1939.
1960s - A progress report on the 1967 construction of the BART subway system in the Bay Area.
1960s: A enactment scene from a 1960s film about conveyor belt safety shows two workmen putting out a fire that erupted at a drive pulley along the belt line.
Joyful soldiers on wheelchairs at the Walter Reed Medical Center go backwards playfully. Amputee soldiers are helped to walk and ride a bicycle in the 1950s. (1950s)
1950s: UNITED STATES: open end of large pipe. Pump draws menhaden up into hull of boat. Crew loads fish onto boat with pump.
CIRCA 1940s - The Army Corps of Enginers builds a revetment, laying slotted stel forms and filling them with concrete, along the Mississippi River, in the 1940s.

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31952317

Stock Video ID: 31952317

CIRCA 1930s - Peas pass through a quality grater, a brine bath, a hopper and a blancher, in a cannery, in Illinois, in 1939.

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