US PATENT SUBCLASS 451 / 77
.~.~ Spark plug

Current as of: June, 1999
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451 /   HD   ABRADING

64  DF  MACHINE {12}
75  DF  .~ Sandblast {13}
77.~.~ Spark plug

DEFINITION

Classification: 451/77

Spark plug:

(under subclass 75) Abrading machine specifically designed to perform abrading operations on a fuel igniting device for an internal combustion engine.

SEE OR SEARCH CLASS

445, Electric Lamp or Space Discharge Component or Device Manufacturing,

7, for a method of making a spark plug or spark gap and subclasses 60+ for the corresponding apparatus.