Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Priority to JP1989046811UpriorityCriticalpatent/JPH02139308U/ja
Priority to US07/420,148prioritypatent/US4997556A/en
Priority to EP89310649Aprioritypatent/EP0376443B1/en
Priority to DE68917888Tprioritypatent/DE68917888T2/de
Priority to CA002001050Aprioritypatent/CA2001050C/en
Priority to KR1019890018322Aprioritypatent/KR960001377B1/ko
Publication of JPH02139308UpublicationCriticalpatent/JPH02139308U/ja
