US PATENT SUBCLASS 238 / 294
.~ Spike lock

Current as of: June, 1999
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238 /   HD   RAILWAYS: SURFACE TRACK

287  DF  TIE-PLATES {16}
294.~ Spike lock {2}
295  DF  .~.~> Lug on spike
296  DF  .~.~> Pawl

DEFINITION

Classification: 238/294

A tie-plate with a spike-locking member, usually engaging the top of the spike-head.