USD313424SExpiredUtility
Piano training device
Individually held — no corporate assignee on recordPriority: Sep 1, 1987Filed: Sep 1, 1987Granted: Jan 1, 1991
Est. expirySep 1, 2007(expired)· nominal 20-yr term from priority
Inventors:Charles H. High
24
PatentIndex Score
4
Cited by
17
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for a piano training device, as shown and described.
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