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US 2,891,445 A
Filed
: 03/29/1957
Issued
: 06/23/1959
Est. Priority Date
: 03/31/1956
Status: Expired due to Term
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Current Assignee
Heinrich Staubach
Original Assignee
Heinrich Staubach
Inventors
HEINRICH STAUBACH
Application Number
US03/649,453
Time in Patent Office
816 Days
Field of Search
US Class Current
356/247
CPC Class Codes
G02B 27/32
Fiducial marks and measurin...
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