Document Type and Number:
Japanese Patent JPH0140117
Kind Code:
Y2
Application Number:
JP2253081U
Publication Date:
December 01, 1989
Filing Date:
February 18, 1981
Export Citation:
International Classes:
H01J7/22; H01J23/14; H01J23/40; (IPC1-7): H01J23/14; H01J7/22
Next Patent: JPH0140118