US PATENT SUBCLASS 303 / 31
.~ Vacuum

Current as of: June, 1999
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303 /   HD   FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS

28  DF  AUTOMATIC {13}
31.~ Vacuum

DEFINITION

Classification: 303/31

Systems in which through a change of pressure in the

control-pipe the motor is operated by pressure of atmosphere in opposition to a partial vacuum.

(1) Note. For cases in which vacuum operation is used in systems with pressure above atmospheric see this class, subclass 4.

(2) Note. See also this class, subclass 12 for systems including devices for producing a vacuum.