- Elvita Research Laboratories, Inc.1
- F. B. Chamberlain Co., St. Louis, Mo., and Harold Storm, doing business as Storm's Seed and Feed Store, Windsor, Ill.1
- George Foster, Inc., St. Paul, Minn., and George Foster, president of the corporation1
- Hachmeister, Inc., Pittsburgh, Pa.1
- Herman D. Seekamp, trading as the Sinu-Vita Co., St. Louis, Mo.1
- Holland Stock Remedy Co., a corporation, Wellington, Ohio, and Alan R. Branson, president and treasurer of the corporation1
- J. W. Quinn Drug Co., a corporation, Greenwood, Miss., and John W. Quinn, president of the corporation1
- John P. Michieli, trading as J. P. Michieli, San Francisco, Calif.1
- Johnstone Drug Sales Corporation1
- Jones Surgical Supply Co., Cleveland, Ohio1
- Lamed Corporation1
- McNeil Laboratories, Inc., Philadelphia, Pa.1
- Modern Products, Inc.1
- Newman Products Co., Brooklyn, N. Y.1
- Nu-Basic Products Co1
- Oripahs1
- Parke, Davis and Co.1
- Pynosol Laboratories, Inc., Chicago, Ill., and Edwin G. Melich, and James J. Melich, president and secretary-treasurer, respectively, of the corporation1
- R. K. Armstrong1
- Roisman Products Co.1