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Device for keeping vehicle operators alert
US 2,754,497 A
Filed
: 03/04/1954
Issued
: 07/10/1956
Est. Priority Date
: 03/04/1954
Status: Expired due to Term
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Current Assignee
Edward Wolpert
Original Assignee
Edward Wolpert
Inventors
Wolpert, Edward
Application Number
US03/414,135
Time in Patent Office
859 Days
Field of Search
US Class Current
340/575
CPC Class Codes
B60K 28/06
responsive to incapacity of...
G08B 21/06
indicating a condition of s...
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