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Patents for Henry W. Ringman
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
2,778,342Jan. 22, 1957H.W. RingmanPoppet type valve distributing system for a servo-motorsawmill log handling
2,838,248Jun. 10, 1958H.W. RingmanRechipperwood grinding machines
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