Manna, the drone delivery company led by the Irish entrepreneur Bobby Healy, is being sued in the High Court in relation to an alleged patent issue. Nordic Unmanned, which manufactures parts for drones and is headquartered in Norway, issued proceedings against Manna Drones yesterday. The case is expected to be vigorously defended by Manna. The case is connected to intellectual property over a piece of hardware used by Manna in its drones.  Nordic Unmanned has been on an acquisition spree of European drone companies and related technology companies over the past twelve months. Following one of these acquisitions it is claiming…