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TEACHING AID FOR ELECTRIC KEYBOARD INSTRUMENT
US 3,470,785 A
Filed
: 08/14/1967
Issued
: 10/07/1969
Est. Priority Date
: 08/14/1967
Status: Expired due to Term
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Current Assignee
James S. Southard
,
Larry R. Shallenberger
Original Assignee
James S. Southard
,
Larry R. Shallenberger
Inventors
Shallenberger, Larry R.
,
Southard, James S.
Application Number
US04/660,376
Time in Patent Office
785 Days
Field of Search
US Class Current
84/470.00R
CPC Class Codes
G09B 15/08
Practice keyboards for teac...
G10H 1/0008
Associated control or indic...
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