US PATENT SUBCLASS 238 / 291
.~.~ Interlock

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

287  DF  TIE-PLATES {16}
290  DF  .~ Lap {1}
291.~.~ Interlock

DEFINITION

Classification: 238/291

(under subclass 290) except that the lapping sections interlock with each other.

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193,