DIFF Subgroup
F22B 31/08 Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
Introduced: September 1968
Full Title
Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus > Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
No child classifications to compare. This is a leaf node in both IPC and CPC.