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Tecna Group has following patents registered:

Patent 0001312140
Oleo-dynamic percussion machine working at constant pressure

Patent 0001344810
Oleo-dynamic percussion machine with double impact mass

Patent WO 2006/097816 A1
Oleo-dynamic percussion machine with on-off slide valve and pilot piston

Patent 0001363596
International version of the patent N°3

Patents BA2012A00019 and BA2012000A00055
Hydraulic hammers with Start & stop and optimized hydraulic circuit with 3D piston