US PATENT SUBCLASS 440 / 12.67
.~.~ Drum type

Current as of: June, 1999
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440 /   HD   MARINE PROPULSION

12.5  DF  SELF-PROPELLED VEHICLE HAVING LAND AND WATER PROPULSION MEANS (E.G., AMPHIBIOUS VEHICLE) {5}
12.66  DF  .~ Wheel-type propulsion means {4}
12.67.~.~ Drum type

DEFINITION

Classification: 440/12.67

Drum-type:

(under subclass 12.66) Subject matter wherein the disk or rim is (1) spaced from, (2) connected to, and (3) rotatable with another disk or rim by a right circular cylindrical member extending along the axle.

(1) Note. Many of the drums have reacting surfaces integral with their cylindrical perimeter surfaces which enhance the transfer of force from the propulsion means to the water.