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Polyfocal spectacles
US 2,576,581 A
Filed
: 07/09/1946
Issued
: 11/27/1951
Est. Priority Date
: 07/09/1946
Status: Expired due to Term
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Current Assignee
Benjamin F. Edwards
Original Assignee
Benjamin F. Edwards
Inventors
Edwards, Benjamin F.
Application Number
US02/682,342
Time in Patent Office
1,967 Days
Field of Search
US Class Current
351/41
CPC Class Codes
G02B 3/14
of variable focal length
G02C 7/085
Fluid-filled lenses, e.g. e...
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