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Priority to JP1988081368UpriorityCriticalpatent/JPH0732282Y2/ja
Priority to US07/221,617prioritypatent/US4840401A/en
Priority to CA000572524Aprioritypatent/CA1302993C/en
Publication of JPH022262UpublicationCriticalpatent/JPH022262U/ja
Application grantedgrantedCritical
Publication of JPH0732282Y2publicationCriticalpatent/JPH0732282Y2/ja