Document Type and Number:
Japanese Patent JPH02107119
Kind Code:
U
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Application Number:
JP1616689U
Publication Date:
August 27, 1990
Filing Date:
February 14, 1989
Export Citation:
International Classes:
G02B13/08; G02B27/00; G02B27/09; (IPC1-7): G02B27/00; G02B13/08
Domestic Patent References:
| JPS5925557U | 1984-02-17 | |||
| JPS5256041U | 1977-04-22 |