(under subclass 141) Subject matter in which the spatial relation and construction of the ignition electrodes is such that the spark gap between them coincides with the longitudinal axis of the plug.
(1) Note. Electrodes of extended area will be considered, for the purpose of classification in this subclass, to have
the spark gap on the axis of the plug if the sparking faces of the electrodes are symmetric about the axis and the spacing gap between the electrodes coincides substantially with the axis of the plug. This note is applicable where the electrodes are plane sheets of material spaced along the longitudinal axis of the plug.
