Hydraulic Units, Incorporated

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5235873 Backlash eliminatorExpiredAug 29, 91Aug 17, 93[G05G]
5129310 Auto rigging for servo actuator systemExpiredJun 15, 90Jul 14, 92[F01B]
4928028 Proportional permanent magnet force actuatorExpiredFeb 23, 89May 22, 90[H02K, H01F]

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