73311692
May 22, 1981
Jan 18, 1983
Domestic Boilers which can Be Operated on Oil, Gas, Coal, Coke, Wood, Solar Energy, Wind Power, Geothermal Power, Electricity; Domestic Water Heaters which can Be Operated on Oil, Gas, Coal, Coke, Wood, Solar Energy, Wind Power, Geothermal Power, Electricity; Oil Burners; Domestic Heat Pumps
Environmental Control Apparatus