Document Type and Number:
Japanese Patent JPS50108401
Kind Code:
U
Application Number:
JP1712074U
Publication Date:
September 05, 1975
Filing Date:
February 12, 1974
Export Citation:
International Classes:
G03B31/06; G03B21/00; G11B3/68; G11B23/44; (IPC1-7): G11B3/68; G03B21/00