Document Type and Number:
Japanese Patent JPS5442616
Kind Code:
Y2
Application Number:
JP1637174U
Publication Date:
December 11, 1979
Filing Date:
February 12, 1974
Export Citation:
International Classes:
H01J31/20; H01J29/02; H01J29/07; (IPC1-7): H01J29/07; H01J31/20