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Priority to JP1688174UpriorityCriticalpatent/JPS50107219U/ja
Priority to NLAANVRAGE7501654,Aprioritypatent/NL180817C/xx
Priority to DE2505716Aprioritypatent/DE2505716C3/de
Priority to GB621275Aprioritypatent/GB1473064A/en
Publication of JPS50107219UpublicationCriticalpatent/JPS50107219U/ja
Priority to US05/870,124prioritypatent/US4168920A/en