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United States Patent 1625463

Inventors:
Ernest, Gauthier
Publication Date:
04/19/1927
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Assignee:
WESTERN ELECTRIC CO
Primary Class:
75/243
Other Classes:
76/DIG.005, 76/115, 407/118, 76/DIG.012, 451/541
International Classes:
B24D3/08; B24D18/00; B24D3/04