US PATENT SUBCLASS 901 / 24
.~.~ Stepper motor

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901 /   HD   ROBOTS

19  DF  DRIVE SYSTEM FOR ARM {5}
23  DF  .~ Electric motor {1}
24.~.~ Stepper motor

DEFINITION

Classification: 901/24

Stepper motor:

Subject matter under cross-reference subcollection 23 wherein the electric motor which drives the arm* produces discrete increments when excited by an input pulse. [figure]