US PATENT SUBCLASS 114 / 178
.~.~ Hinged covers
Current as of: June, 1999
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| 114 / | HD | SHIPS |
|
| 173 | DF | PORTS {2} |
| 177 | DF | .~ Light and air {1} |
| 178 |  | .~.~ Hinged covers |
DEFINITION
Classification: 114/178
Light and air ports provided with hinged, pivoted, or swinging covers for closing the same, usually forming air and water tight joints when closed.