It also sold its Chroma multi-airport operational database to Norwegian airport operator Avinor and supplied Milan Malpensa operators SEA with a Bluetooth queue measurement system.

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Silva, former National Security Agency official now at VeriSign, the main operator of the Internet-address database that directs billions of digital packets around the world every day.

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Mr Thomas said water in any mine would be a risk but when the mine operator applies for a licence to work a particular reserve of coal, there is a national database with records showing where that seam had been worked before.

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