Automatic telephone alarm
United States Patent 2098133

Publication Date:
11/02/1937
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Assignee:
Hyman, Seegel
Samuel, Seegel
Adolph, Emerman E.
Florence, Carnahan
Primary Class:
379/40
Other Classes:
379/41, 340/539.100, 340/534, 340/539.140, 200/1A, 200/11G, 335/106
International Classes:
G08B27/00; H04M11/04