Frank W. Hetman

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Minneapolis, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Thermally insulated and connected window frame members and the meth...
- Patent number 4,067,163
- Issue date Jan 10, 1978
- Frank W. Hetman
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS