Number | Date | Country | Kind |
---|---|---|---|
3-215426 | Aug 1991 | JPX | |
3-341103 | Dec 1991 | JPX |
Number | Date | Country |
---|---|---|
503682 | Jun 1954 | CAX |
45-37775 | Nov 1970 | JPX |
45-87776 | Nov 1970 | JPX |
117486 | Nov 1974 | JPX |
57-198098 | Dec 1982 | JPX |
Entry |
---|
Tetrahedron, vol. 46, No. 23, 1990 (printed in Great Britain), pp. 7677-7676. |