Document Type and Number:
Japanese Patent JPH03127331
Kind Code:
U
Application Number:
JP3423490U
Publication Date:
December 20, 1991
Filing Date:
April 02, 1990
Export Citation:
International Classes:
G03B13/10; (IPC1-7): G03B13/10
Domestic Patent References:
| JPS57173824A | 1982-10-26 |