US PATENT SUBCLASS 267 / 74
.~.~ Single


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

69  DF  ELASTIC EXTENSION DEVICES {2}
73  DF  .~ Tension spring {1}
74.~.~ Single


DEFINITION

Classification: 267/74

(under subclass 73) Structure wherein the extension device comprises one spring element only.