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1950s - The Bureau of Standards in the 1950s.
CIRCA 1944 - Radio receivers are tested and the main power supply and auxiliary battery are shown at the Hallicrafters Company in Clearing, Illinois.
1940s - In 1943, new B29 bombers bomb Japan.
Army scientists design and manufacture complicate military equipment at an army laboratory in the 1950s. (1950s)
CIRCA 1955 - Meteorologists work on predicting tornadoes.
1940s - American bombers attack German oil refineries in World War II.
1950s - The National Institute of Health researches polio in 1956.

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5300741

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Rattlesnakes are studied in 1956.

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