Document Type and Number:
Japanese Patent JPS4945542
Kind Code:
U
Application Number:
JP8676172U
Publication Date:
April 22, 1974
Filing Date:
July 23, 1972
Export Citation:
International Classes:
G02B7/182; G02B7/18; (IPC1-7): G02B7/18
Foreign References:
| US3644021A | 1972-02-22 |