Ohio Brass porcelain signals
 In 1910 the Ohio Brass Company bought up a failing insulator
manufacturer in Barberton, Oh. that had been, along with the
Locke Insulator Manufacturing Company, producing insulators
for Ohio Brass to sell. Now Ohio Brass began making their own
insulators.
 
  Reported styles: U-180, U-180A, U-180B, U-247, U-256,
U-257A, U-291, U-292, U-292A, U-293, U-296, U-297, U-303,
U-315, U-367

  Reported colors: brown, pumpkin, white, blue, yellow, gray,     
cobalt, light blue, green, dark blue, chocolate brown, pale blue
U-180As all are embossed on
dome/crown edge "B" within "O"
U-256s embossed on dome/crown edge "B" within "O"
U-257A very faintly
marked seemingly
underglaze on dome/crown
edge "B" within "O"
U-280B faintly underglaze
on skirt "B" within "O"
Four U-297As recess embossed
on skirt "B" within "O"
U-296 recess embossed on skirt
"B" within "O"
U-303 underglaze on dome "B" within "O"
U-368 recess embossed on dome/crown edge "B" within "O"