US PATENT SUBCLASS 137 / 390
.~.~ Manual control

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

386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
389  DF  .~ With second diverse control {1}
390.~.~ Manual control

DEFINITION

Classification: 137/390

(under subclass 389) Apparatus in which the second control is a manual control.

SEE OR SEARCH THIS CLASS, SUBCLASS:

181, for traps in diverse fluid containing pressure systems having automatic liquid discharge control with an auxiliary

manual control.