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US 1,879,516 A
Filed
: 10/08/1930
Issued
: 09/27/1932
Est. Priority Date
: 10/08/1930
Status: Expired due to Term
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Current Assignee
Rowan, John
Original Assignee
Rowan, John
Inventors
Rowan, John
Application Number
US02/487,104
Time in Patent Office
720 Days
Field of Search
US Class Current
248/478
CPC Class Codes
G02C 7/14
Mirrors; Prisms
G02C 9/04
by fitting over or clamping on
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