Document Type and Number:
Japanese Patent JPS5131497
Kind Code:
B1
Application Number:
JP4961171A
Publication Date:
September 07, 1976
Filing Date:
July 07, 1971
Export Citation:
International Classes:
G03B7/083; G03B7/08; G03B7/081; G03B9/62; (IPC1-7): G03B7/08; G03B9/62