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ELECTRONIC PIANO
US 3,516,321 A
Filed
: 01/19/1967
Issued
: 06/23/1970
Est. Priority Date
: 01/19/1967
Status: Expired due to Term
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Current Assignee
BPO Acquisition Corporation
Original Assignee
Michael R. Harris
Inventors
Harris, Michael R.
Application Number
US04/610,423
Time in Patent Office
1,251 Days
Field of Search
US Class Current
84/687
CPC Class Codes
G10H 1/057
by envelope-forming circuits
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