Document Type and Number:
Japanese Patent JPS5239122
Kind Code:
U
Application Number:
JP12505475U
Publication Date:
March 19, 1977
Filing Date:
September 11, 1975
Export Citation:
International Classes:
G03B21/54; G03B23/02; G11B23/08; G11B23/087; (IPC1-7): G11B23/08; G03B23/02
Domestic Patent References:
| JPS4913889U | 1974-02-05 |