Document Type and Number:
Japanese Patent JPS5251790
Kind Code:
Y2
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Application Number:
JP2484273U
Publication Date:
November 25, 1977
Filing Date:
February 27, 1973
Export Citation:
International Classes:
G03B21/50; G03B1/58; G03B31/00; (IPC1-7): G03B31/00; G03B1/58