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Place Washington (D.C.) Remove constraint Place: Washington (D.C.) Subject World War (1939-1945) Remove constraint Subject: World War (1939-1945) Subject United States. Office of Scientific Research and Development. National Defense Research Committee Remove constraint Subject: United States. Office of Scientific Research and Development. National Defense Research Committee Subject Scientific apparatus and instruments Remove constraint Subject: Scientific apparatus and instruments Subject Beckman Instruments, inc. Remove constraint Subject: Beckman Instruments, inc.