US PATENT SUBCLASS 114 / 57
.~ Screw propeller type

Current as of: June, 1999
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114 /   HD   SHIPS

56.1  DF  DISPLACEMENT-TYPE HULL (e.g., specific aftbody) {9}
57.~ Screw propeller type

DEFINITION

Classification: 114/57

Inventions in the exterior form of vessels propelled by screw-propellers.