Compressed air and gas systems being air compressors and gas compressors; compressed air machines; vacuum filters being dust filters for vacuum cleaners, and being air filters for vacuum motors and dust separators; machines for separating oil and water being condensate separators; water separators for oil-water separation, being machines; separators for liquids, namely, oil-water separation, being machines; air oil separators being components of engines; apparatus for compressing air, being a...