182 / | HD | FIRE ESCAPE, LADDER, OR SCAFFOLD |
63.1 | DF | HAVING TRANSPOSITIONING BASE AND ERECTING MEANS {4} |
64.1 | DF | .~ Ladder pivotably mounted on transpositioning base (e.g., on vehicle) {2} |
65.1 | .~.~ About vertical axis {3} | |
66.1 | DF | .~.~.~> Extension ladder (i.e., ladder having sliding section) {2} |
67.4 | DF | .~.~.~> Folding ladder |
67.5 | DF | .~.~.~> Having screw rod for erecting ladder about horizontal pivot |