US PATENT SUBCLASS 173 / 211
.~.~ Mechanical spring


Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
210  DF  .~ With impact cushioning means {2}
211.~.~ Mechanical spring


DEFINITION

Classification: 173/211

Mechanical spring:

(under subclass 210) Apparatus wherein the impact cushioning means is a resilient element that recovers its shape after being stretched or compressed.