US PATENT SUBCLASS 218 / 82
.~.~ Identical units back-to-back

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}
43  DF  .~ Air-current blowout {18}
82.~.~ Identical units back-to-back

DEFINITION

Classification: 218/82

Identical units back-to-back:

(under subclass 43) Subject matter wherein a pair of circuit breaking units are connected in series with each other.