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Priority claimed from GB55813/66Aexternal-prioritypatent/GB1173150A/en
Application filed by Philips NvfiledCriticalPhilips Nv
Priority claimed from NL6816601Aexternal-prioritypatent/NL6816601A/xx
Application grantedgrantedCritical
Publication of AT290622BpublicationCriticalpatent/AT290622B/en