US PATENT SUBCLASS 267 / 87
.~.~ Sinuous spring loading surface supported by other spring

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

80  DF  SPRING PANEL {9}
86  DF  .~ Diverse types of superposed metallic springs {2}
87.~.~ Sinuous spring loading surface supported by other spring

DEFINITION

Classification: 267/87

(under subclass 86) Device wherein the uppermost layer, composed of a series of zigzag springs, is mounted on a layer composed of a different kind of spring.