(under subclass 386) Dispensers in which the follower is operated by a screw mechanism.
SEE OR SEARCH CLASS
239, Fluid Sprinkling, Spraying, and Diffusing,
324, for screw type followers for the fluid in a spraying system.
401, Coating Implements With Material Supply,
172+, wherein the implement has a cylindrical wall reservoir for the material and a piston movable relative to the wall by screw means to force the material into the reservoir or from the reservoir to the applying tool.
