US PATENT SUBCLASS 405 / 81
.~.~ Fishway

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.~.~ Fishway {2}
82  DF  .~.~.~> Elevator
83  DF  .~.~.~> Closed channel

DEFINITION

Classification: 405/81

Fishway:

(under subclass 80) Method or apparatus to enable fish to pass an obstruction in a stream.