Document Type and Number:
Japanese Patent JPS5240786
Kind Code:
Y2
Application Number:
JP4475173U
Publication Date:
September 14, 1977
Filing Date:
April 14, 1973
Export Citation:
International Classes:
G04B13/02; G04B19/02; G04B31/00; (IPC1-7): G04B19/02; G04B31/00