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Patents Grantslast 30 patents

Information Patent Grant
Electric whistle
- Patent number 8,760,272
- Issue date Jun 24, 2014
- Yen-Hsiang Lien
- G08 - SIGNALLING

Patents Applicationslast 30 patents

Information Patent Application
ELECTRIC WHISTLE
- Publication number 20140022063
- Publication date Jan 23, 2014
- Yen-Hsiang LIEN
- G08 - SIGNALLING