Document Type and Number:
Japanese Patent JPS5550939
Kind Code:
Y2
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Application Number:
JP12090375U
Publication Date:
November 27, 1980
Filing Date:
September 02, 1975
Export Citation:
International Classes:
H01J37/22; G01N23/225; H01J37/15; H01J37/26; (IPC1-7): H01J37/22; G01N23/225