Document Type and Number:
Japanese Patent JPS52163331
Kind Code:
U
Application Number:
JP7272876U
Publication Date:
December 10, 1977
Filing Date:
June 05, 1976
Export Citation:
International Classes:
G03B23/02; G11B23/00; G11B23/06; (IPC1-7): G03B23/02; G11B23/00
Domestic Patent References:
| JPS432860Y1 | 1968-02-06 |