US PATENT SUBCLASS 238 / 221
.~.~ Notched head


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.~.~ Notched head {1}
222  DF  .~.~.~> Twin


DEFINITION

Classification: 238/221

The abutting rail-heads are mortised on one side to receive the bridge-piece.