US PATENT SUBCLASS 267 / 71
.~.~ Single

Current as of: June, 1999
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267 /   HD   SPRING DEVICES

69  DF  ELASTIC EXTENSION DEVICES {2}
70  DF  .~ Compression spring {1}
71.~.~ Single {1}
72  DF  .~.~.~> Drawbars inclosed

DEFINITION

Classification: 267/71

(under subclass 70) Structure wherein the extension device comprises one spring element only.