US PATENT SUBCLASS 104 / 156
.~.~ Piston tube

Current as of: June, 1999
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104 /   HD   RAILWAYS

287  DF  CAR-CARRIED PROPULSION SYSTEM {3}
155  DF  .~ Pneumatic {3}
156.~.~ Piston tube

DEFINITION

Classification: 104/156

(under subclass 155) Pneumatic car-propulsion systems in which a car-carried piston slides in a slotted tube extending longitudinally along the trackway and is acted upon by air therein for effecting the propulsion of the car.