US PATENT SUBCLASS 405 / 83
.~.~.~ Closed channel

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

52  DF  FLUID CONTROL, TREATMENT, OR CONTAINMENT {7}
80  DF  .~ Flow control {7}
81  DF  .~.~ Fishway {2}
83.~.~.~ Closed channel

DEFINITION

Classification: 405/83

Closed channel:

(under subclass 81) Method or apparatus wherein the fishway is in the form of a pipe or other enclosed waterway.