Saw blade, a sawing machine and a system thereof

Sawing machine for sawing micro trenches in an area comprising a first layer and a second layer, said first layer being a surface layer comprising asphalt or concrete, and said second layer being a bearing layer to said first layer, wherein said micro trenches are adapted for receiving at least one duct/cable;

• said sawing machine comprising a stabilizing device arranged for stabilizing the walls of the micro trenches when placing ducts/cables into the micro trenches, and further comprising at least one saw blade comprising coding elements forming at least one code symbol representing a unique identity for said saw blade, wherein said at least one code symbol function as an immobilizer for said sawing machine, said sawing machine being arranged to not start if said unique identity is not valid.