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Annunciator system for hospitals
US 2,910,680 A
Filed
: 02/27/1956
Issued
: 10/27/1959
Est. Priority Date
: 02/27/1956
Status: Expired due to Term
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Current Assignee
George H. Mclain
Original Assignee
George H. Mclain
Inventors
Mclain, George H.
Application Number
US03/567,761
Time in Patent Office
1,338 Days
Field of Search
US Class Current
340/311.2
CPC Class Codes
G08B 5/36
using visible light sources
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