Johnson & Johnson DePuy Synthes factory in Cork , Ireland , specialises in producing replacement hip and knee joints and has adopted IoT technology to create real-time digital twins of old physical machines to gain insights , reduce costs ( by 10 %) and improve maintenance ( 5 % drop in downtime ). What is especially impressive is the fact that the factory showed the value of incorporating Factory 4.0 technology into an existing plant rather than starting afresh at greater expense .

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