Document Type and Number:
Japanese Patent JPS5280647
Kind Code:
U
Application Number:
JP16830975U
Publication Date:
June 16, 1977
Filing Date:
December 12, 1975
Export Citation:
International Classes:
G03B31/00; (IPC1-7): G03B31/00
Domestic Patent References:
| JPS5133432B1 | 1976-09-20 |