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Application filedfiledCritical
Priority to JP1987111620UpriorityCriticalpatent/JPH063725Y2/ja
Priority to US07/221,617prioritypatent/US4840401A/en
Priority to CA000572524Aprioritypatent/CA1302993C/en
Publication of JPS6416462UpublicationCriticalpatent/JPS6416462U/ja
Application grantedgrantedCritical
Publication of JPH063725Y2publicationCriticalpatent/JPH063725Y2/ja
