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Common metals and their alloys; signs, number plates and vehicle registration plates of metal; signs, number plates and vehicle registration plates of metal provided with readable data carriers, in particular chips; sign reinforcing apparatus and sign holders, in particular for vehicle registration plates, of metal. Scientific, measuring, signalling and inspecting apparatus, scientific inspecting instruments, data processing apparatus, computers, electric installations for controlling industrial operations, in particular in connection with the creation of vehicle registration plates, monitoring apparatus, electric, regulating apparatus, electric; automated control apparatus for die-stamping machines and stamp presses; computer software for processing and/or evaluating data for signs, preferably for motor vehicle registration plates, software for reading, processing and/or evaluating data from number plate, in particular vehicle registration plate, labels and/or chips, computer software for generating, processing and/or manufacturing motor vehicle registration plates; software for registering vehicle registration plates; data carriers, in particular chips, for number plates, in particular vehicle registration plates, and stickers; data-reading apparatus, in particular apparatus for the wireless reading of data from number plate, in particular vehicle registration plate, data carriers; electric and electronic monitoring apparatus; electrical signal transmitters and receivers; apparatus and installations for monitoring and checking number plates, in particular vehicle registration plates.