Air-conditioning apparatus; air filtering installations; air purifying apparatus and machines; disinfectant apparatus for medical purposes; electric air deodorizers; electric heaters for commercial use; furnaces; gas burners; germicidal lamps for purifying air; heating apparatus for solid, liquid or gaseous fuels; heating boilers; heating elements; heating installations; laundry drying machines; lighting apparatus, namely, lighting installations; sanitary installations in the nature of steam ...