US PATENT SUBCLASS 52 / 161
.~.~ Screw operated

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

155  DF  PIERCING OR EXPANDING EARTH ANCHOR {7}
160  DF  .~ Spreader cam or plate {1}
161.~.~ Screw operated

DEFINITION

Classification: 52/161

(under subclass 160) Structure in which the actuating means for the cam or plate includes a screw.