Document Type and Number:
Japanese Patent JPS52141940
Kind Code:
U
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Application Number:
JP4998576U
Publication Date:
October 27, 1977
Filing Date:
April 23, 1976
Export Citation:
International Classes:
G03B13/10; G03B9/70; G03B17/20; (IPC1-7): G03B17/20; G03B9/70
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