Vibratory signaling device
United States Patent 2854542

Inventors:
Boysen Jr., Albert P.
Krebs, Luther E.
Publication Date:
09/30/1958
Export Citation:
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
335/88
Other Classes:
335/162, 335/92, 335/94
International Classes:
H04M1/23
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US Patent References:
1348842Electric relay or circuit-closing device
1254658N/A
1061919N/A
RE21038N/A