Document Type and Number:
Japanese Patent JPS4943980
Kind Code:
B1
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Application Number:
JP3978869A
Publication Date:
November 26, 1974
Filing Date:
May 22, 1969
Export Citation:
International Classes:
G03B21/50; G03B1/54; G03B9/10; G03B19/18; G03B31/02; G03B31/04