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Priority to JP1988076709UpriorityCriticalpatent/JPH0631770Y2/ja
Priority to US07/363,050prioritypatent/US4987421A/en
Priority to CA000602331Aprioritypatent/CA1328503C/en
Priority to AU36274/89Aprioritypatent/AU614625B2/en
Publication of JPH01179614UpublicationCriticalpatent/JPH01179614U/ja
Application grantedgrantedCritical
Publication of JPH0631770Y2publicationCriticalpatent/JPH0631770Y2/ja