US PATENT SUBCLASS 218 / 121
.~.~ Single-pole

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}
118  DF  .~ Vacuum {5}
121.~.~ Single-pole {3}
122  DF  .~.~.~> Pressure monitoring means
123  DF  .~.~.~> Contact structure {5}
134  DF  .~.~.~> Housing structure {3}

DEFINITION

Classification: 218/121

Single-pole:

(under subclass 118) Subject matter including a contact arrangement in which all contacts in the arrangement connect in one position or another to a common contact.