Gearboxes, other than for land vehicles; reduction gears, other than for land vehicles; servo gears; helical gear units, right-angle gear units; variable-speed gear units; industrial gear units; planetary gears, other than for land vehicles; couplings for machines; fans for motors and engines; hoods (parts of machines); parts of all aforesaid goods as far as included in this class; all aforesaid goods not for land vehicles.