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.)
Expired
Application number
CA706346A
Inventor
Sakurai Shigeki
Watabe Shijio
Morio Atsuo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Publication date
Application grantedgrantedCritical
Publication of CA706346ApublicationCriticalpatent/CA706346A/en