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HPI (TIANJIN) MUSICAL INSTRUMENT CO., LTD
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TIANJIN CITY, TW
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Patent Application
Tuning Ring for Adjusting Sound Timbre of Drum Head
Publication number
20190139521
Publication date
May 9, 2019
HPI (Tianjin) Musical Instrument Co., Ltd.
Aijun Lu
G10 - MUSICAL INSTRUMENTS ACOUSTICS