Creator
- Nirdlinger, M1
- Northwestern Terra Cotta Company1
- O.W. Ketcham Terra Cotta Works1
- Pelham, George F (George Frederick), 1866-19371
- Pilcher, Lewis F1
- Post, George Browne, 1837-19131
- Potter, Wilson1
- Proudfoot, Bird and Rawson1
- Raritan Clay Co1
- Renwick, Aspinwall & Tucker1
- Richards, McCarty & Bulford (Columbus, Ohio)1
- Roth, Emery, 1871-19481
- Rouse & Goldstone1
- Rowland, John T., 1872?-19451
- Rutan and Russell1
- Sass & Springsteen1
- Schwartz & Gross1
- Shampan & Shampan1
- Shattuck and Hussey1
- Smith, Hinchman, and Grylls, inc.1