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Priority to JP9903486UpriorityCriticalpatent/JPH0310127Y2/ja
Priority to GB8715224Aprioritypatent/GB2193693B/en
Priority to CA000540773Aprioritypatent/CA1304222C/en
Publication of JPS634878UpublicationCriticalpatent/JPS634878U/ja
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Publication of JPH0310127Y2publicationCriticalpatent/JPH0310127Y2/ja