Document Type and Number:
Japanese Patent JPS492534
Kind Code:
A
Application Number:
JP3825272A
Publication Date:
January 10, 1974
Filing Date:
April 18, 1972
Export Citation:
International Classes:
G03B31/00
Domestic Patent References:
| JPS3725059Y1 |
Foreign References:
| US2777901A | 1957-01-15 |
Next Patent: JPS492535