Document Type and Number:
Japanese Patent JPS4939437
Kind Code:
U
Application Number:
JP7969972U
Publication Date:
April 06, 1974
Filing Date:
July 07, 1972
Export Citation:
International Classes:
G03B27/54; G02B15/04; G02B19/00; G02B27/18; G03B21/00; (IPC1-7): G02B27/18; G02B15/04; G02B19/00; G03B21/00; G03B27/54
Foreign References:
| US3609012A | 1971-09-28 |