US PATENT SUBCLASS 116 / 142 FV
.~.~.~ Using vacuum

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

137 R  DF  HORNS, WHISTLES AND COMPRESSIONAL WAVE GENERATORS {6}
142 R  DF  .~ Diaphragm horns {2}
142 FP  DF  .~.~ Fluid pressure operated {1}
142 FV.~.~.~ Using vacuum

Unofficial Alpha Subclasses: R FP FV

DEFINITION

Classification: 116/142

(under subclass 137) Devices include audible alarms in which a vibrating diaphragm is the source of sound.

SEE OR SEARCH THIS CLASS, SUBCLASS:

58, for vehicle energy actuated pneumatic signals.