(under the class definition) Subject matter including plural, different in kind, or type heating elements.
(1) Note. Usually either the plural heating elements operate on the same charge, or one of the heating elements operates as a substitute for the other.
SEE OR SEARCH CLASS
432, Heating,
94, for heating apparatus having (a) two distinctly different types of heat generators, (b) a heat generator and a source of heat that is not a generator, or (c) a combustion type heat generating means using two different fuels.
