US PATENT SUBCLASS 91 / 387
.~.~ Spring-type feedback bias means


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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

358 R  DF  WORKING MEMBER POSITION FEEDBACK TO MOTIVE FLUID CONTROL {12}
385  DF  .~ Bias-type input and feedback signal means {2}
387.~.~ Spring-type feedback bias means


DEFINITION

Classification: 91/387

(under subclass 385) Apparatus in which the working member position signal is generated by a resilient material which is variably stressed by the position of the working member.