Document Type and Number:
Japanese Patent JPS4944241
Kind Code:
U
Application Number:
JP8428572U
Publication Date:
April 18, 1974
Filing Date:
July 19, 1972
Export Citation:
International Classes:
G03B31/06; G03B31/00; G11B17/22; (IPC1-7): G03B31/00; G11B17/22