U-339-339C

(Through hole styles and all scarce to rare. The intended use is not known.)
U-339
Manufacturer or Marking
No Name (Pittsburg) (USA)
U-339
Size: 95mm X 76mm (3 ¾ x 3)
Example in Photo: No Name (Pittsburg) (USA)
Photo Credit: Ken Willick
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U-339A
Manufacturer or Marking
Fred Locke (USA)
U-339A
Size: 114mm X 149mm (4 ½ x 5 ⅞)
Example in Photo: Fred Locke
Photo Credit: National Insulator association
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U-339B
Manufacturer or Marking
Fred Locke (USA)
U-339B
Size: 92mm X 95mm (3 x 3 ¾)
Example in Photo: No Name
Photo Credit: National Insulator association
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U-339C
Manufacturer or Marking
No Name (Locke) (USA)
U-339C
Size: 76mm X 95mm (3 x 3 ¾)
Example in Photo: No Name (Locke) (USA)
Photo Credit: Elton Gish
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