US PATENT SUBCLASS 116 / 55
.~ Pneumatic train pipe

Current as of: June, 1999
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116 /   HD   SIGNALS AND INDICATORS

28 R  DF  VEHICLE {12}
55.~ Pneumatic train pipe

DEFINITION

Classification: 116/55

(under subclass 28) Devices include compressed-air-train-pipe signaling arrangements.

SEE OR SEARCH THIS CLASS, SUBCLASS:

65, for pneumatic type signals.

70, for fluid pressure variation indicating alarms.

SEE OR SEARCH CLASS

137, Fluid Handling, 494+, particularly subclasses 505+ for fluid-pressure regulators, per se.

303, Fluid-Pressure and Analogous Brake Systems,

1, for miscellaneous type systems, and subclass 86 for miscellaneous operations on control pipe.