Device for introducing a gaseous substance in a fluid and...
Diaphragm carburetor for an internal combustion engine that...
Diaphragm means for driving a secondary throttle valve in a two-
Diffused aeration system
Diffused bubble aeration system
Direct contact water-to-air heat exchanger and method
Distributor for micro-quantities of liquid
Downflow heater plant for briefly heating a liquid with steam
Dual barrel carburetor for motorcycles
Dual carburetor
Dual chamber carbonator for dispensing drinks