Document Type and Number:
Japanese Patent JPS53133644
Kind Code:
U
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Application Number:
JP3810577U
Publication Date:
October 23, 1978
Filing Date:
March 29, 1977
Export Citation:
International Classes:
G03B1/18; G03B1/22; G03B31/00; (IPC1-7): G03B1/22; G03B31/00