US PATENT SUBCLASS 238 / 123
.~ Rack

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

122  DF  RAILS {20}
123.~ Rack

DEFINITION

Classification: 238/123

Rails having toothed or rack tread-surfaces, usually for use on steep grades with a locomotive having a cog drive-wheel.