Document Type and Number:
Japanese Patent JPH01108531
Kind Code:
U
Application Number:
JP172488U
Publication Date:
July 21, 1989
Filing Date:
January 12, 1988
Export Citation:
International Classes:
G03B27/54; (IPC1-7): G03B27/54
Domestic Patent References:
| JPS5917438U | 1984-02-02 | |||
| JPS58144345U | 1983-09-29 |