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Priority to JP5329489UpriorityCriticalpatent/JPH02143977U/ja
Priority to AU53866/90Aprioritypatent/AU605710B1/en
Priority to CA 2016137prioritypatent/CA2016137C/en
Publication of JPH02143977UpublicationCriticalpatent/JPH02143977U/ja
Priority to US07/769,503prioritypatent/US5390372A/en
Priority to KR2019930019025Uprioritypatent/KR940002519Y1/ko