Document Type and Number:
Japanese Patent JPS50157943
Kind Code:
U
Application Number:
JP7055274U
Publication Date:
December 27, 1975
Filing Date:
June 17, 1974
Export Citation:
International Classes:
G03B31/00; G03B31/02; G11B23/04; G11B23/44; (IPC1-7): G03B31/02; G11B23/04