US PATENT SUBCLASS 324 / 398
.~.~.~ With air gap in ground circuit

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

378  DF  INTERNAL-COMBUSTION ENGINE IGNITION SYSTEM OR DEVICE {12}
393  DF  .~ In situ testing of spark plug {5}
397  DF  .~.~ By shorting the plug to ground to indicate spark plug condition {1}
398.~.~.~ With air gap in ground circuit

DEFINITION

Classification: 324/398

With air gap in ground circuit:

(under subclass 397) Subject matter having the air gap connected in parallel with the spark plug circuit.