sentences:  The solution was a pad of fine silicone rubber fingers, stuck to the top and bottom internal surfaces of the cartridge, to provide just enough grip on the uneven ticket stack, without putting too much load on the print head.AVANTIX Mobile is the successor to the SPORTIS system which had been developed in the mid-1980s for British Rail.SPORTIS was the first fully computerised portable ticketing system for use by on-train staff and Revenue Protection Inspectors, and in other situations where mobile ticket-issuing facilities are required.