Number | Date | Country |
---|---|---|
62-105687 | May 1987 | JPX |
63-176174 | Jul 1988 | JPX |
1-111439 | Apr 1989 | JPX |
3-234754 | Oct 1991 | JPX |
Entry |
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Database WPI, Derwent Publications, AN-84-272013, JP-59-159394, Sep. 8, 1984. |
Database WPI, Derwent Publications, AN-94-363286, JP-6-286315, Oct. 11, 1994. |