US PATENT SUBCLASS 72 / 453.18
.~.~ Having hydraulic or pneumatic return

Current as of: June, 1999
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72 /   HD   METAL DEFORMING

429  DF  WITH MEANS TO DRIVE TOOL {11}
453.01  DF  .~ Including pneumatic- or fluid-actuated tool support {7}
453.18.~.~ Having hydraulic or pneumatic return {1}
453.19  DF  .~.~.~> Riveting tool

DEFINITION

Classification: 72/453.18

Having hydraulic or pneumatic return:

(under subclass 453.01) Apparatus wherein the tool is moved by a fluent or liquid medium toward the work and is also moved away from the work by a fluent or liquid medium.