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Priority claimed from GB2270773Aexternal-prioritypatent/GB1471138A/en
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Priority claimed from GB2270774Aexternal-prioritypatent/GB1459892A/en
Publication of JPS50144689ApublicationCriticalpatent/JPS50144689A/ja
Publication of JPS5148473B2publicationCriticalpatent/JPS5148473B2/ja