US PATENT SUBCLASS 218 / 93
.~.~.~.~ Piston

Current as of: June, 1999
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218 /   HD   HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES

1  DF  ARC PREVENTING OR EXTINGUISHING DEVICES {14}
89  DF  .~ Interposed non-conductor {3}
91  DF  .~.~ Liquid {14}
92  DF  .~.~.~ Operating mechanism structure or arrangement {4}
93.~.~.~.~ Piston

DEFINITION

Classification: 218/93

Piston:

(under subclass 92) Subject matter including details of a solid or hollow disc-like plunger moving linearly in a close fitting bored receptacle.