Document Type and Number:
Japanese Patent JPS5347822
Kind Code:
U
Application Number:
JP13806077U
Publication Date:
April 22, 1978
Filing Date:
October 17, 1977
Export Citation:
International Classes:
G03B31/00; G03B31/02; (IPC1-7): G03B31/00
Domestic Patent References:
| JPS49131439A | 1974-12-17 |