- Scientific Instrument Service1
- Sengbusch1
- Sharp & Dohme1
- Sharp & Smith, Germany1
- Shepard & Dudley, New York, New York1
- Sims, J. Marion (James Marion) 1813-18831
- Smedley's Hydro Co. Limited, Matlock Bank1
- Smithy, Horace Gilbert1
- Stanley and Patterson1
- Storz Instrument Company, St. Louis, Missouri1
- T.C.W. Co., USA1
- Tarnier, S. (Stephane) 1828-1897 Charles Lentz and Sons, Philadelphia, Pennsylvania1
- Taylor Instrument Companies, Rochester, NY1
- Taylor, Benjamin Walter M.D.1
- The Arlington Chemical Company, Yonkers, N.Y., U.S.A.1
- The Geer Drug Co. Wholesale Druggists, Charleston, Spartanburg, &Greenville, SC1
- The J.F. Hartz Company, Detroit, Michigan1
- The National Drug Company,1
- The Torsion Balance Co.1
- Thomae Co.1