US PATENT SUBCLASS 451 / 165
.~.~.~ Ultrasonic


Current as of: June, 1999
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451 /   HD   ABRADING

64  DF  MACHINE {12}
162  DF  .~ Reciprocating tool {2}
164  DF  .~.~ Rectilinear {9}
165.~.~.~ Ultrasonic


DEFINITION

Classification: 451/165

Ultrasonic:

(under subclass 164) Abrading machine wherein the grinding tool is vibrated at a frequency higher than that heard by the human ear (i.e., above about 20,000 cycles per second).