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US 3,057,275 A
Filed
: 10/29/1958
Issued
: 10/09/1962
Est. Priority Date
: 10/29/1958
Status: Expired due to Term
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Current Assignee
John F. Byrne
,
Lewis E. Walkup
Original Assignee
John F. Byrne
,
Lewis E. Walkup
Inventors
Walkup, Lewis E.
,
Byrne, John F.
Application Number
US03/770,543
Time in Patent Office
1,441 Days
Field of Search
US Class Current
399/136
CPC Class Codes
G03B 17/50
with both developing and fi...
G03G 15/221
Machines other than electro...
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