US PATENT SUBCLASS 454 / 81
.~.~ Porthole ventilator

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
78  DF  .~ Waterborne {3}
81.~.~ Porthole ventilator

DEFINITION

Classification: 454/81

Porthole ventilator:

(under subclass 78) Subject matter wherein the ventilating means is, or is used in conjunction with, an embrasure in the side of a vessel.