US PATENT SUBCLASS 116 / 140
.~ Variable tone

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

137 R  DF  HORNS, WHISTLES AND COMPRESSIONAL WAVE GENERATORS {6}
140.~ Variable tone

DEFINITION

Classification: 116/140

(under subclass 137) Devices include whistles and horns provided with devices whereby the pitch of the note can be gradually varied during its sounding.

SEE OR SEARCH CLASS

84, Music,

350, for reed type organ pipes, subclass 364 for tuneable reeds, and subclass 375, for minor reeds.