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"