US PATENT SUBCLASS 299 / 22
.~.~ Piston


Current as of: June, 1999
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299 /   HD   MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL

20  DF  EXPANSIBLE BREAKING-DOWN DEVICES {2}
21  DF  .~ Fluid-pressed element {1}
22.~.~ Piston


DEFINITION

Classification: 299/22

(under subclass 21) Apparatus in which one fluid pressed element comprises a piston.