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Priority claimed from JP520972Aexternal-prioritypatent/JPS5120199B2/ja
Priority claimed from JP520872Aexternal-prioritypatent/JPS5120198B2/ja
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Publication of NL7300346ApublicationCriticalpatent/NL7300346A/xx
Publication of NL174242BpublicationCriticalpatent/NL174242B/xx
Application grantedgrantedCritical
Publication of NL174242CpublicationCriticalpatent/NL174242C/xx