US PATENT SUBCLASS 49 / 200
.~.~ And counterbalance

Current as of: June, 1999
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49 /   HD   MOVABLE OR REMOVABLE CLOSURES

197  DF  UP-AND-OVER TYPE; E.G., MOVES FROM VERTICAL TO WITHDRAWN HORIZONTAL OVERHEAD POSITION {4}
199  DF  .~ With operator {1}
200.~.~ And counterbalance

DEFINITION

Classification: 49/200

(under subclass 199) Device provide with additional means acting against the force of gravity for balancing the closure in an adjusted position.