US PATENT SUBCLASS 213 / 23
.~.~ Preliminary spring

Current as of: June, 1999
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213 /   HD   RAILWAY DRAFT APPLIANCES

7  DF  CUSHIONED {9}
22  DF  .~ Combined spring and friction {8}
23.~.~ Preliminary spring {1}
24  DF  .~.~.~> Shoes and wedges with casings

DEFINITION

Classification: 213/23

(under subclass 22) Devices wherein the cushioning action is against the action of a spring preliminary to the combined action of spring and friction.