Light sensitive alarm system
United States Patent 3191048
US Patent References:
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Inventors:
Cowen, Richard G.
Publication Date:
06/22/1965
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Assignee:
Cowen, Richard G.
Primary Class:
250/221
Other Classes:
250/210, 340/555
International Classes:
G08B13/183; G08B13/189; G08B13/18
US Patent References:
3056120Supervised condition detection and alarm apparatus
Foreign References:
GB191121262A