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REVERSIBLE CONCEALED IMAGE DEVICE AND METHOD OF USE
US 3,508,344 A
Filed
: 07/17/1967
Issued
: 04/28/1970
Est. Priority Date
: 07/17/1967
Status: Expired due to Term
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Current Assignee
Richard E. Thomas
Original Assignee
Richard E. Thomas
Inventors
Thomas, Richard E.
Application Number
US04/653,776
Time in Patent Office
1,016 Days
Field of Search
US Class Current
434/327
CPC Class Codes
G09B 3/04
of chart form masks G09B17/02
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