Document Type and Number:
Japanese Patent JPS5057221
Kind Code:
A
Application Number:
JP10520073A
Publication Date:
May 19, 1975
Filing Date:
September 18, 1973
Export Citation:
International Classes:
G03B31/00; G03B31/02; (IPC1-7): G03B31/00; G03B31/02
Domestic Patent References:
| JPS4844329B1 | 1973-12-24 |