37 Installation, assembly as well as maintenance and repair of mechanical engineering products, namely, mechanical storage, conveying and loading apparatus and machines, and mechanical equipment and machines for handling work pieces and parts therefor, namely, mechanical gears, step gears, small gear boxes, reduction gear units, chain storage devices, transfer installations, elevating tables, rotary tables, in particular step switching rotary tables, elevating rotary tables, walking beam conveyors, heavy duty lifting equipment, machine tools, drum drives, lifting and lowering conveyors, accumulation conveyors, roller conveyors, lift shuttles, lifting columns, sequencing conveyors, rotary indexing tables, revolving transfer tables, globoid gears, globoid rotary tables, disc cam mechanisms, longitudinal drives, large rotary tables, foundry rotary tables