US PATENT SUBCLASS 440 / 48
HELICAL SCREW
Current as of: June, 1999
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DEFINITION
Classification: 440/48
HELICAL SCREW:
(under the class definition) Device wherein the propelling means consists of blades which encircle a hub and follow the pattern of a spiral (Archimedes screw).
(1) Note. Buoyant helical propelling means are also included in this subclass and not in subclass 98, buoyant propelling means.
