Document Type and Number:
Japanese Patent JPS4854933
Kind Code:
A
Application Number:
JP8889171A
Publication Date:
August 02, 1973
Filing Date:
November 08, 1971
Export Citation:
International Classes:
G03B19/18; G03B31/00; G03B31/02; (IPC1-7): G03B31/02
Domestic Patent References:
| JPS4211195Y1 | 1967-06-21 |