U-989: USA
3 5/8" X 5 1/2" (92mm X 139mm)
No markings
{Southern Porcelain Co.}
Picture courtesy Elton Gish
U number assignment by Jack Tod
Return to the National Insulator US Unipart page
3 5/8" X 5 1/2" (92mm X 139mm)
Return to the National Insulator US Unipart page