Document Type and Number:
Japanese Patent JPS52155549
Kind Code:
U
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Application Number:
JP6423776U
Publication Date:
November 25, 1977
Filing Date:
May 20, 1976
Export Citation:
International Classes:
G03B27/24; G03B27/00; G03D7/00; (IPC1-7): G03B27/00; G03D7/00