US PATENT SUBCLASS 84 / 167
.~.~ Key locks

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ Automatic {13}
167.~.~ Key locks

DEFINITION

Classification: 84/167

Means to prevent the keys from moving as the piano is played.

(1) Note. See this class, subclass 74.