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US 2,989,890 A
Filed
: 11/13/1956
Issued
: 06/27/1961
Est. Priority Date
: 11/13/1956
Status: Expired due to Term
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Current Assignee
Robert Dressler
Original Assignee
Robert Dressler
Inventors
Dressler, Robert
Application Number
US03/621,844
Time in Patent Office
1,687 Days
Field of Search
US Class Current
356/389
CPC Class Codes
G01C 11/00
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