US PATENT SUBCLASS 267 / 73
.~ Tension spring

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

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

DEFINITION

Classification: 267/73

(under subclass 69) Structure wherein when the device is extended, the elastic medium is put under tension in the same direction, as explained in the definition of subclass 70 above.