US PATENT SUBCLASS 104 / 4
.~ Portable shifter

Current as of: June, 1999
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104 /   HD   RAILWAYS

2  DF  TRACK LAYERS {11}
4.~ Portable shifter

DEFINITION

Classification: 104/4

(under subclass 2) Apparatus in which the detachable track sections are continuously shifted from the rear of the moving vehicle to the front thereof.