US PATENT SUBCLASS 137 / 454.6
.~ Retained by bonnet or closure

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

454.2  DF  REMOVABLE VALVE HEAD AND SEAT UNIT {3}
454.6.~ Retained by bonnet or closure

DEFINITION

Classification: 137/454.6

(under subclass 454.2) Devices in which the unit is retained in position by a valve bonnet or access-opening closure.