English translation: deployment, global /systematic upgrading
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Here's the context: "in the event that interface modifications are required, XXX and YYY shall mutually agree to establish the necessary provisions for this and decide the strategy to be adopted (***noria sur l’ensemble du parc ou remplacement au coup par coup)."
Certainly not a water-wheel. Robert gives "suite uninterrompue des véhicules qui vont et viennent". I fail to see a connection.