US PATENT SUBCLASS 267 / 89
.~ With means to vary preliminary tension of spring

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

80  DF  SPRING PANEL {9}
89.~ With means to vary preliminary tension of spring

DEFINITION

Classification: 267/89

(under subclass 80) Device in which a means is provided to impose an initial stress upon the spring prior to the reception thereon of the ultimate load, so as to vary the effective resilience.