74654737
Mar 30, 1995
Oct 8, 1996
industrial heating systems typically described as heat transfer systems, heat energy systems, thermal liquid systems, steam boilers, solid fuel and refuse combustion systems, and heat recovery systems, each of such systems being primarily comprised of one or more of heaters, solid fuel burners, silos, coolers, conveyors, gas or liquid fuel burners, heat exchangers, electric heaters, and steam generators; electrical controls sold therein
Environmental Control Apparatus