Stephen L. Grauel

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Ardmore, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Combined mounting for through-the-wall viewer and intercom
- Patent number 4,130,728
- Issue date Dec 19, 1978
- Stephen L. Grauel
- E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS