Tube structure
United States Patent 2109274

Inventors:
Hans, Niclassen
Publication Date:
02/22/1938
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Assignee:
PHILIPS NV
Primary Class:
313/318.010
Other Classes:
313/262, 220/2.10R, 313/318.050, 313/250, 313/251, 174/50.500
International Classes:
H01J29/87