US PATENT SUBCLASS 135 / 92
.~.~ Heating

Current as of: June, 1999
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135 /   HD   TENT, CANOPY, UMBRELLA, OR CANE

87  DF  PORTABLE SHELTER (I.E., TENT OR CANOPY) {18}
91  DF  .~ With heating, lighting, or ventilating {2}
92.~.~ Heating

DEFINITION

Classification: 135/92

Heating:

(under subclass 91) Apparatus having means to elevate the temperature of the interior of the shelter.