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United States Patent 1400421

Inventors:
Henri, Colomb
Publication Date:
12/13/1921
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Assignee:
Henri, Colomb
Primary Class:
368/237
Other Classes:
968/157, 74/553, 411/935, 411/272, 411/433, 411/429, 403/371
International Classes:
G04B19/14; G04B19/06