Rotary helical gear pump for liquids or gases - has cylindrical chambers which interconnect each other with screw rotor having helical lobes which innermost and suction device
CH680743A5
Rotary heliclal gear pump for liquids or gases - contains lips on crests of lobes and bottoms between adjacent lobes that engage on rotation of rotors to improve sealing
EP0038374A1
A compression refrigerator unit adjustable in accordance with the liquid flowing out from the evaporator
CH641547A5
Refrigerating unit of the compression type with regulation carried out as a function of the liquid emerging from the evaporator
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Refrigerating unit of the compression type with an expansion device
