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TEACHING APPARATUS
US 3,538,621 A
Filed
: 11/16/1967
Issued
: 11/10/1970
Est. Priority Date
: 11/16/1967
Status: Expired due to Term
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Current Assignee
Mayeda Wataru
Original Assignee
Mayeda Wataru
Inventors
MAYEDA WATARU
Application Number
US04/683,664
Time in Patent Office
1,090 Days
Field of Search
US Class Current
434/342
CPC Class Codes
G09B 3/02
of the type wherein the stu...
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