Air-intake tubes and filters for after-market installation of automotive engines; Air filters for pneumatic controls being part of machines; Bearings, as parts of machines; Bushings for use as parts of machines; Dust removing installations for cleaning purposes; Electric motors, and their parts, not for land vehicles; Machine couplings and transmissions, except for land vehicles; Machine elements not for land vehicles, namely, shock prevention devices for machines; Mechanical engine parts for...