Document Type and Number:
Japanese Patent JPS52156442
Kind Code:
U
Application Number:
JP4569877U
Publication Date:
November 28, 1977
Filing Date:
April 11, 1977
Export Citation:
International Classes:
H01J29/39; (IPC1-7): H01J29/39
Domestic Patent References:
| JP44017660A |
Foreign References:
| US2726328A | 1955-12-06 |