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US Patent D783084 Piano
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Steinway & Sons
Steinway & Sons
United States Patent and Trademark Office
United States Patent and Trademark Office
D783084
Frank Pollaro
April 4, 2017
‌
US Patent 8344230 Method for improving the sound of musical instruments
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Steinway & Sons
Steinway & Sons
United States Patent and Trademark Office
United States Patent and Trademark Office
8344230
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January 1, 2013
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