CHASE, Circuit Judge.
The decree was based upon two grounds, non-infringement and invalidity of Claim 2, which is the only claim in issue.
Kasarjian's patent involves spark plugs for use in airplane engines. The usual aviation spark plug assembly has a core in the center consisting of a metal rod or spindle. The lower end of this spindle constitutes one of the electrodes at the spark gap, and therefore the whole must be insulated from the other electrode known...
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