Zheng CAO

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McKinney, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Automatic drain
- Patent number 7,530,123
- Issue date May 12, 2009
- Zheng Cao
- E03 - WATER SUPPLY SEWERAGE

Patents Applicationslast 30 patents

Information Patent Application
AUTOMATIC DRAIN
- Publication number 20080098516
- Publication date May 1, 2008
- Zheng CAO
- E03 - WATER SUPPLY SEWERAGE