Document Type and Number:
Japanese Patent JPS56112859
Kind Code:
U
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Application Number:
JP1138080U
Publication Date:
August 31, 1981
Filing Date:
January 31, 1980
Export Citation:
International Classes:
H01J7/24; H01J23/00; H01J23/033; (IPC1-7): H01J23/033; H01J7/24