Document Type and Number:
Japanese Patent JPS4939438
Kind Code:
U
Application Number:
JP8047572U
Publication Date:
April 06, 1974
Filing Date:
July 06, 1972
Export Citation:
International Classes:
G03B31/04; G03B21/00; G03B31/00; (IPC1-7): G03B31/00; G03B21/00