US PATENT SUBCLASS 324 / 172
.~.~ Including synchronized recording medium

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

160  DF  ELECTRICAL SPEED MEASURING {7}
166  DF  .~ Including speed-related frequency generator {5}
172.~.~ Including synchronized recording medium

DEFINITION

Classification: 324/172

(under subclass 166) Subject matter in which means for producing a speed signal includes a recording medium and means to move it at a speed proportional to speed being measured.