| http://www.w3.org/ns/prov#value | - The size, shape and configuration of the insulator 4, the center electrode 2, and the shell 3 are not critical except for the dimensions defining and limiting the surface gap 7 and the configuration of the spark plug below the broken line AA. It is understood of course that the insulator should always be of the proper thickness to permit spark generation by the high voltage pulse of the ignition s
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