US PATENT SUBCLASS 324 / 396
.~.~ With an air gap in series with spark plug to indicate spark plug condition

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}
396.~.~ With an air gap in series with spark plug to indicate spark plug condition

DEFINITION

Classification: 324/396

With an air gap in series with spark plug to indicate spark plug condition:

(under subclass 393) Subject matter having the air gap connected in series with the spark plug secondary circuit to give an indication of the condition of the spark plug.