(under subclass 75) Apparatus in which the control is by a means analyzing the composition of or responding to the relative quantity of a material formed in the combustion area, e.g., carbon or CO[supscrpt]2[end supscrpt] in combustion gases, etc.
SEE OR SEARCH CLASS
73, Measuring and Testing,
23.2+, for apparatus for gas analysis.
200, Electricity: Circuit Makers and Breakers,
61.03, for a smoke responsive switch.
324, Electricity: Measuring and Testing, appropriate subclass for apparatus for testing the electrical properties of gases. 422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
