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US 3,371,321 A
Filed
: 04/15/1965
Issued
: 02/27/1968
Est. Priority Date
: 04/15/1965
Status: Expired due to Term
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Current Assignee
Edward N. Adams
Original Assignee
Edward N. Adams
Inventors
Adams, Edward N.
Application Number
US04/448,469
Time in Patent Office
1,048 Days
Field of Search
US Class Current
434/157
CPC Class Codes
G09B 7/04
characterised by modifying ...
G09B 7/08
characterised by modifying ...
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