US PATENT SUBCLASS 182 / 228.6
.~ Hollow rung

Current as of: June, 1999
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182 /   HD   FIRE ESCAPE, LADDER, OR SCAFFOLD

228.1  DF  RUNG OR RUNG-TO-STILE CONNECTION {5}
228.6.~ Hollow rung

DEFINITION

Classification: 182/228.6

Hollow rung:

(under subclass 228.1) Device wherein the ladder step is an elongated, tubular body member.