Cambridge Glass Co. (Nearcut unregistered mark) 1902-1954

c in triangle mark

Guernsey Glass B in a triangle mark

late 1960s - late 1990s

Guernsey Glass, Harold Bennett B in a triangle Trademark, Cambridge OH

late 1960s - late 1990s

Holophane Company Trademark 1990

Jeannette Trademark (letter J in triangle)

found on Salt and Peppers

Turner Brothers Glass Company Trademark Terre Haute, IN 1905-1930

Whitall Tatum Trademark 1920s-1930s

Made mostly bottles, insulators