Compressed air pumps, vacuum pumps, high pressure pumps for use in air compressors; air compressors and blowing machines for the compression, exhaustion and transport of gases; air filters for use in air compressors being parts of industrial machines; filter housings for air compressors being parts of machines; filters as parts of air compressors; air filters being parts for engines; air filters for mechanical purposes; filters for cleaning cooling air, for engines