Document Type and Number:
Japanese Patent JPS5526563
Kind Code:
U
Application Number:
JP10930878U
Publication Date:
February 20, 1980
Filing Date:
August 08, 1978
Export Citation:
International Classes:
G03B11/04; (IPC1-7): G03B11/04
Domestic Patent References:
| JPS4720231B1 | ||||
| JPS483029B1 | ||||
| JPS5139525B1 | 1976-10-28 |