Warning system of dwelling houses, hotels, and similar establishments
United States Patent 2202188

Inventors:
Alfredo, Cianchi
Publication Date:
05/28/1940
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Assignee:
Alfredo, Cianchi
Primary Class:
340/331
Other Classes:
340/326, 340/815.730, 340/286.080, 340/815.890
International Classes:
G08B5/36; G08B5/22