US PATENT SUBCLASS 160 / 191
.~.~.~.~ Spring

Current as of: June, 1999
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160 /   HD   FLEXIBLE OR PORTABLE CLOSURE, PARTITION, OR PANEL

130  DF  PLURAL STRIP, SLAT, OR PANEL TYPE {11}
181  DF  .~ With mounting or supporting means {12}
188  DF  .~.~ With operating means {4}
190  DF  .~.~.~ Counterbalance only {1}
191.~.~.~.~ Spring

DEFINITION

Classification: 160/191

(under subclass 190) Devices in which the counterbalance means includes the use of springs.

(1) Note. Weight means may be used in addition.