US PATENT SUBCLASS 251 / 91
.~.~ Requiring modification of valve

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

89  DF  WITH MEANS FOR BLOCKING OR DISABLING ACTUATOR {6}
90  DF  .~ Attachments {2}
91.~.~ Requiring modification of valve

DEFINITION

Classification: 251/91

(under subclass 90) Attachments wherein there is modification of the valve structure to receive the disabling unit.