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Robert T. Ruthven
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Wayland, MI, US
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last 30 patents
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Patent Grant
Ultrasonic tool and method for securing a covering to a frame
Patent number
6,821,367
Issue date
Nov 23, 2004
Steelcase Development Corporation
Douglas B. MacDonald
B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL