37 Installation and repair of earth drilling machines and rock drilling machines, of earth drilling wagons and rock drilling wagons, of drill rigs, and of mobile drilling rigs, the foregoing related to the mining, rock drilling, and construction industries and excluding parts and fittings for electric scooters, electric balance cars, electric unicycles, motorcycles, electric bicycles, electric tricycles, mopeds, and wheelchairs; installation and repair of vehicles and conveyances for mobile drilling rigs, of crawler vehicles for locomotion over earth and rock, of surface drilling units and of surface drilling rigs, the foregoing related to the mining, rock drilling, and construction industries and excluding parts and fittings for electric scooters, electric balance cars, electric unicycles, motorcycles, electric bicycles, electric tricycles, mopeds, and wheelchairs