US PATENT SUBCLASS 299 / 22
.~.~ Piston
Current as of:
June, 1999
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299 /
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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.