7 compressed air generators with trailer-connectors for light automobiles and tractors which mainly consist of a compressor, pressure regulator, a multi-circuit safety valve, compressed air tanks, control valves and regulator valves, coupling elements and compressed air lines, sold as a unit; single cylinder and tow cylinder compressors; compressed air controllers for cranes, excavators, loaders, mining and leveling devices; rotary connectors for hydraulic and for pneumatic pipe lines for mobile engines