US PATENT SUBCLASS 213 / 29
.~.~ Interengaging friction springs

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}
29.~.~ Interengaging friction springs {1}
30  DF  .~.~.~> Plate springs

DEFINITION

Classification: 213/29

(under subclass 22) Devices wherein interengaging springs generate the frictional resistance by movement upon each other.