US PATENT SUBCLASS 84 / 168
.~.~ Couplers

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ Automatic {13}
168.~.~ Couplers

DEFINITION

Classification: 84/168

Means, usually pneumatic, for sounding two notes together, especially octaves.