Title:
Fire alarm
Document Type and Number:
United States Patent 2999477
Inventors:
Publication Date:
09/12/1961
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Assignee:
Pratt, Verneur E.
Pratt, Edmund C.
Pratt, Edmund C.
Primary Class:
Other Classes:
116/158
International Classes:
G08B17/02; G10K1/074; G10K1/00
US Patent References:
Foreign References:
| FR526262A |