US PATENT SUBCLASS 137 / 303
.~.~.~ With disabling means

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

272  DF  HYDRANT TYPE {15}
301  DF  .~ Protection against freezing {1}
302  DF  .~.~ Stop and waste {3}
303.~.~.~ With disabling means

DEFINITION

Classification: 137/303

(under subclass 302) Apparatus including selective means for preventing operation of the auxiliary or drain valve.

(1) Note. These devices are usually operative during the summer.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

89+, for means for disabling or preventing operation of a valve of general utility, and see the search notes thereto.