(under subclass 194) Device comprising means to compensate
for the inequalities of the surface, on which the ladder rests.
SEE OR SEARCH THIS CLASS, SUBCLASS:
170, for independent, laterally moving ladder props on an uneven surface.
SEE OR SEARCH CLASS
108, Horizontally Supported Planar Surfaces,
144.11+, for a vertically adjustable horizontal planar surface. 248, Supports,
157, for a vertically adjustable stand, subclass 161 for a standard type stand wherein the standard is vertically adjustable, subclass 188.2 for a furniture elevating or leveling device, and subclasses 354+ for an adjustable length prop.
