(under subclass 1) Method or apparatus wherein the vessel is raised or lowered in a substantially vertical manner.
(1) Note. For placement in this subclass, the vessel should not be required to undergo any significant horizontal movement during the lifting or lowering operation, accordingly, the inclined plane type of launching structure will not be found herein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
86, for subject matter relating to the lifting of a vessel in a canal.
SEE OR SEARCH CLASS
212, Traversing Hoists, appropriate subclasses for simple
hoisting apparatus having means to raising a boat and shifting it horizontally.
