Machines destined for metallurgy industry, for mining and petroleum exploitation, machine tools and their detached pieces (included in this class); tools used mechanically, notably tightening tools for piece works, tools stationery and mobile (as parts of machines), apparatus for conveying and transport of piece work and tools, exchange of tools and pieces and work; jaws of tension (parts of machines) compressed air jack and hydraulic jack; shock absorbers; electric command device; electronic and compressed or hydraulic apparatus for declenchment of tightening devices stationery and mobile; silencers; air filters; apparatus for clearing of cleaners particularly oil coming from installations of compressed air (all these pieces in so far as detached pieces or destined to be branched on the machines)