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Visual optical instrument having a combined reticle and field flattening element
US 2,952,180 A
Filed
: 06/02/1958
Issued
: 09/13/1960
Est. Priority Date
: 06/02/1958
Status: Expired due to Term
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Current Assignee
Cameron B. Estes
Original Assignee
Cameron B. Estes
Inventors
Estes, Cameron B.
Application Number
US03/739,352
Time in Patent Office
834 Days
Field of Search
US Class Current
396/380
CPC Class Codes
G02B 23/14
Viewfinders for photographi...
G02B 27/32
Fiducial marks and measurin...
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