Document Type and Number:
Japanese Patent JPS57150802
Kind Code:
U
Application Number:
JP3740781U
Publication Date:
September 21, 1982
Filing Date:
March 17, 1981
Export Citation:
International Classes:
G02B6/00; G02B5/00; G02B26/02; (IPC1-7): G02B5/14; G02B5/00
Domestic Patent References:
| JPS5181631A | 1976-07-17 | |||
| JPS5012745B1 | 1975-05-14 |