.~ With work deck vertically adjustable relative to floor {4}
200
.~.~ By buoyancy control
DEFINITION
Classification: 405/200
By buoyancy control:
(under subclass 196) Method or apparatus wherein support for the platform is by way of a floatable chamber, the floatability of which a chamber is varied to cause the platform to be moved up and down with relation to the bed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
205+, for a buoyant chamber used to facilitate assembly of a structure.