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Priority claimed from GB1680173Aexternal-prioritypatent/GB1469635A/en
Application filed by Haines Donald JohnfiledCriticalHaines Donald John
Publication of ATA287374ApublicationCriticalpatent/ATA287374A/de
Application grantedgrantedCritical
Publication of AT339195BpublicationCriticalpatent/AT339195B/de
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