US PATENT SUBCLASS 299 / 37.4
.~.~.~ Hydraulic piston and cylinder type

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

29  DF  HARD MATERIAL DISINTEGRATING MACHINES {17}
36.1  DF  .~ Floor-working {3}
37.3  DF  .~.~ Impact or hammering type cutter {2}
37.4.~.~.~ Hydraulic piston and cylinder type

DEFINITION

Classification: 299/37.4

Hydraulic piston and cylinder-type:

(under subclass 37.3) Impact or hammering cutter wherein the

falling weight is assisted by compressed fluid pushing on a solid mass within a tubular vessel.