US PATENT SUBCLASS 251 / 90
.~ Attachments

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.~ Attachments {2}
91  DF  .~.~> Requiring modification of valve
92  DF  .~.~> Acting on valve limit stop {1}

DEFINITION

Classification: 251/90

(under subclass 89) Devices comprising a separate unit attached to a conventional valve structure.