US PATENT SUBCLASS 173 / 120
.~.~ With means to adjust spring force

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


173 /   HD   TOOL DRIVING OR IMPACTING

90  DF  IMPACTING DEVICES (E.G., HAMMERS) {19}
202  DF  .~ Hammer head driven by spring {4}
120.~.~ With means to adjust spring force

DEFINITION

Classification: 173/120

(under subclass 119) Apparatus in which a means is included to selectively vary the degree to which the resilient element is strained.