37 Maintenance of cleaning machines; Machinery installation, maintenance and repair, and dismantling of industrial machinery for power-operated grinding wheels, machines for grinding concrete slabs and stone slabs, grinding machine for concrete slabs and stone slabs, electric grinding machines for concrete slabs and stone slabs, fully automatic grinding machines for concrete slabs and stone slabs, heavy duty grinding machines for concrete slabs and stone slabs, grinding tools for grinding machines, grinding wheels being parts of grinding machines, grinding wheels being parts of power-operated grinding machines, grinding instruments being inserts for power-operated grinding machines, polishing discs for power-operated stone polishing, polishing machine for concrete slabs and stone slabs, concrete coating machines, machines for chamfering and side treatment of concrete slabs and stone slabs, machines for cleaning surfaces using high pressure water, concrete vibrators, pneumatically driven industrial machine presses, hydraulically driven industrial machine presses, industrial pressing machines, industrial machine presses, machines for pressing paving stones, machines for pressing concrete slabs, packing machines for pavers and wall stones, assembly line of refining pavers and wall stones, concrete slab making machines and concrete finishing machines, fully automatic and semi-automatic casting machines, concrete slab making machines, concrete finishing machines, packaging machines for concrete slabs, milling machines, calibration machines for the treatment of natural and cement-bound stones and slabs, milling cutters for milling machines, stone working machines, slotting machines, floor sweeping, cleaning, and washing machines, cleaning and washing machines for concrete slabs and stone slabs, cutting, drilling, abrading, and sharpening machines and apparatus, machines utilizing rotational motion for high energy surface finishing and material treatment, impregnating machines being concrete finishing machines, packaging machines, wrapping machines, robotic packaging machines, parts thereof for the machines and machine systems mentioned above, and pneumatic and hydraulic controllers for the machines, engines, and motors mentioned above; All of the above-mentioned services not for elevators, escalators, and moving walks