US PATENT SUBCLASS 318 / 451
.~.~ Mechanically vibrating device as reference device (e.g., tuning fork)

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

445  DF  AUTOMATIC AND/OR WITH TIME-DELAY MEANS (E.G., AUTOMATIC STARTING AND/OR STOPPING) {20}
449  DF  .~ With respect to a fixed standard, master or reference device {2}
451.~.~ Mechanically vibrating device as reference device (e.g., tuning fork)

DEFINITION

Classification: 318/451

(under subclass 449) Subject matter in which a tuning-fork or other mechanically vibratable device is used as a standard, master, or reference device with which the operation or control of the motor is compared and controlled.

SEE OR SEARCH THIS CLASS, SUBCLASS:

119, for motor systems where the motor is an electrically driven tuning-fork.

SEE OR SEARCH CLASS

84, Music,

457, for tuning-fork, per se, when used for producing musical notes.