US PATENT SUBCLASS 440 / 69
.~.~.~ With open bottom
Current as of:
June, 1999
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440 /
HD
MARINE PROPULSION
49
DF
SCREW PROPELLER
{12}
66
DF
.~ Having means to control flow around propeller {3}
68
DF
.~.~ Hull channel {1}
69
.~.~.~ With open bottom
DEFINITION
Classification: 440/69
With open bottom:
(under subclass 68) Device wherein the lowermost side of the channel is removed.
