United States Patent 2826708
Inventors:
Foster Jr., John S.
Publication Date:
03/11/1958
Assignee:
Foster Jr., John S.
Other Classes:
219/121.120, 313/161, 313/231.010, 376/121, 313/563, 219/121.330, 164/DIG.004
International Classes:
H01J27/18; H01J27/16