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地球に優しいエネルギー Earth-friendly energy

I installed automatic door closers on most of the doors in KEC building with tenants. It is nicer to use this kind of automatic gadget than the cautionary statement to have the doors closed firmly. 
Furthermore it is better and more earth-friendly to use the mechanical semi-eternal power like hydraulic cylinder than to use the electric motors that consume the finite man-made electric energy.