US PATENT SUBCLASS 238 / 136
.~ Step tread

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

122  DF  RAILS {20}
136.~ Step tread

DEFINITION

Classification: 238/136

Rails having heads of step-tread form for street-railway use, so that the wheels of street-vehicles may run upon the depressed tread-surface.

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