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US 2,914,746 A
Filed
: 03/27/1956
Issued
: 11/24/1959
Est. Priority Date
: 03/27/1956
Status: Expired due to Term
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Current Assignee
Edward W. James
Original Assignee
Edward W. James
Inventors
James, Edward W.
Application Number
US03/574,254
Time in Patent Office
1,337 Days
Field of Search
US Class Current
525/382
CPC Class Codes
G07C 9/215
the system having a variabl...
G07C 9/253
visually
Y10T 70/7904
Magnetic features
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