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US 2,807,981 A
Filed
: 03/14/1955
Issued
: 10/01/1957
Est. Priority Date
: 03/14/1955
Status: Expired due to Term
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Current Assignee
Edgar S. Barnes
Original Assignee
Edgar S. Barnes
Inventors
Barnes, Edgar S.
Application Number
US03/494,087
Time in Patent Office
932 Days
Field of Search
US Class Current
359/427
CPC Class Codes
G02B 27/32
Fiducial marks and measurin...
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