Push, pull and rotary cables and cable apparatus; rollers and pulleys, cable tension regulators; screw jacks; control mechanisms for engines, machines and apparatus and for component parts for engines, machines and apparatus; power transmission systems; parts and fittings for all the aforesaid goods; all included in Class 7, but not including chains, sprockets, chain guides, chain snubbers, hydraulic and mechanical chain tensioners or variable cam timing systems.;