U-293A: USA
3 1/4" X 3 1/2" (82mm X 88mm)
(dome incuse) PP
{Porcelain Products}
Picture courtesy Bob Berry
3 1/8" X 3 3/8" (79mm X 85mm)
(skirt incuse) B & O
U number assignment by Jack Tod.
Return to the National Insulator US Unipart page