US PATENT SUBCLASS 238 / 222
.~.~.~ Twin

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

151  DF  RAIL JOINTS {28}
218  DF  .~ Tread bridge {7}
221  DF  .~.~ Notched head {1}
222.~.~.~ Twin

DEFINITION

Classification: 238/222

The abutting rail-heads are mortised on both sides to receive a pair of bridge-pieces.