Teaching aid of a non-orientable surface
Description
Claims
The ornamental design of a teaching aid of a non-orientable surface, as shown and described.
Referenced Cited
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Other references
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Patent History
Patent number: D911438
Type: Grant
Filed: May 15, 2019
Date of Patent: Feb 23, 2021
Inventor: David Green (Harper, TX)
Primary Examiner: Lauren D McVey
Application Number: 29/691,318
Type: Grant
Filed: May 15, 2019
Date of Patent: Feb 23, 2021
Inventor: David Green (Harper, TX)
Primary Examiner: Lauren D McVey
Application Number: 29/691,318
Classifications