Piano teaching aid
The broken lines at the tail of the piano teaching aid, and the unshaded surfaces within the broken lines at the tail, indicate that any portion of the article between the broken line areas forms no part of the claimed design. The broken line features along the tongue feature of the piano teaching aid depict features of the article that form no part of the claimed design.
Claims
The ornamental design for a piano teaching aid, as shown and described.
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Type: Grant
Filed: Jan 21, 2020
Date of Patent: May 17, 2022
Inventor: Paul William Wells (Milton Keynes)
Primary Examiner: Jasmine Mlinarcik
Application Number: 29/721,425