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United States Patent 1703408

Inventors:
Smith, Franklin S.
Publication Date:
02/26/1929
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Assignee:
PRODUCTS PROT CORP
Primary Class:
361/40
Other Classes:
313/622, 336/199, 336/192, 252/372, 218/155, 336/90, 336/60, 336/65, 218/158, 310/55, 336/182, 174/15.100, 313/325
International Classes:
H01F27/20; H01F27/08