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TEACHING MACHINE
US 3,484,950 A
Filed
: 06/12/1968
Issued
: 12/23/1969
Est. Priority Date
: 06/12/1968
Status: Expired due to Term
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32
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Current Assignee
Frederick R. Kling
,
Robert Serrell
Original Assignee
Frederick R. Kling
,
Robert Serrell
Inventors
Serrell, Robert
,
Kling, Frederick R.
Application Number
US04/739,900
Time in Patent Office
559 Days
Field of Search
US Class Current
434/316
CPC Class Codes
G09B 7/08
characterised by modifying ...
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