US PATENT SUBCLASS 246 / 219
.~ Control circuits

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

218  DF  ELECTRIC ACTUATION {9}
219.~ Control circuits

DEFINITION

Classification: 246/219

(under subclass 218) Circuits and systems of circuits especially adapted for controlling the operation of switch and signal motors, but not equivalent to a complete block, crossing, or other system.