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National Museum of American History (U.S.). Division of Electricity and Modern Physics (2)
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Begun, S. Joseph (Semi Joseph) (1)
Bell Telephone Laboratories (1)
Cady, Walter Guyton, 1874-1973 (physicist) (1)
Espenschied, Lloyd, 1889-? (electrical engineer) (1)
James Knights Co. (1)
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Smithsonian Astrophysical Observatory. Department of Contracts, Grants and Property Management (1)
Telefunken Wireless Telegraph Company. (1)
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Archives Center, National Museum of American History (4)
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Piezoelectricity
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Archives Center, National Museum of American History
Walter Guyton Cady Papers
Archival
Materials
Archives Center, National Museum of American History
Finding aid
Archival
Materials
Archives Center, National Museum of American History
Finding aid
Archival
Materials
Smithsonian Institution Archives
Finding aid
Archives Center, National Museum of American History
Wire recorder
Archival
Materials
Smithsonian Institution Archives
Finding aid
Archival
Materials
Smithsonian Institution Archives
Finding aid
Archival
Materials
Smithsonian Institution Archives
Finding aid