William S. Stefnik

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Calgary, Alberta, CA

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Patents Grantslast 30 patents

Information Patent Grant
Unitized partition system
- Patent number 4,680,902
- Issue date Jul 21, 1987
- William S. Stefnik
- E04 - BUILDING
Information Patent Grant
Unitized partition system
- Patent number 4,667,450
- Issue date May 26, 1987
- William S. Stefnik
- E04 - BUILDING