(under subclass 207) Device including means providing a mechanical advantage or motor means connected between the sections to cause relative movement therebetween.
SEE OR SEARCH THIS CLASS, SUBCLASS:
12+, for an extension ladder mounted on a land vehicle having control or actuation means.
64.1+, for a ladder which has extension means combined with positioning means.
158, for a lazy tong type ladder with power or mechanical means to extend the same.
