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All Patents in class 340/870.44
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
2,074,396Mar. 23, 1937W.H. HoweImpedance Variation Amplifiermachine tool controls
2,083,759Jun. 15, 1937J.C. TempleMechanism for Sizinggrinding machines
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