Yun H. Zhang

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Richmond Hill, CA

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Patents Grantslast 30 patents

Information Patent Grant
Pressure balanced torsion system for a backrest and the like
- Patent number 5,348,378
- Issue date Sep 20, 1994
- Yun H. Zhang
- A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...