Focused electromechanical device
United States Patent 2565159
Inventors:
Williams, Alfred L. W.
Publication Date:
08/21/1951
Other Classes:
99/451, 381/190, 367/157, 367/166, 310/369, 310/334, 116/DIG.018, 310/371, 366/108, 99/646R
International Classes:
G10K11/32; G10K11/00