Document Type and Number:
Japanese Patent JPS51103421
Kind Code:
U
Application Number:
JP2137875U
Publication Date:
August 19, 1976
Filing Date:
February 15, 1975
Export Citation:
International Classes:
G03B31/06; G03B21/00; G11B23/08; G11B23/44; (IPC1-7): G11B23/08; G03B21/00
Domestic Patent References:
| JP40023151A | ||||
| JP48063005B |
Foreign References:
| US3388632A | 1968-06-18 |