(under subclass 144) Subject matter in which the said joint is between the center electrode and the insulating core.
(1) Note. This subclass includes spark plugs having a significant joint between the center electrode and the insulating core or significant joint structure between the shell and core in addition to the significant joint between the center electrode and core. Where the only significant joint is between the insulator and the shell, see the Search This Class, Subclass notes below.
(2) Note. to subclass
SEE OR SEARCH THIS CLASS, SUBCLASS:
120, where the joint structure includes a fluid valve.
124, where there is an intensifier in the center electrode.
128, where there is a plurality of insulated center electrodes. 136, where the center electrode is made of a plurality of parts.
144, where the only significant joint is between the insulator and the shell, and see the search notes for other classes providing for closely related subject matter.
