- Dawson Springs Water Co., Inc., Dawson Springs, Ky., and William R. Whitford, president1
- Des Moines Incubator Co., a corporation, Des Moines, Iowa1
- Diarsenol Co., Inc., Buffalo, N. Y.1
- Direct Sales Co., Inc., Buffalo, N. Y.1
- Dr. A. C. Daniels, Inc.1
- Dr. Buren L. Corley, trading as Dr. Corley's Products, San Francisco, Calif.1
- Dr. D. Jayne and Son, Inc.1
- Dwarfies Corporation, Council Bluffs, Iowa1
- E. W. Downs, San Francisco, Calif.1
- Economy Hog & Cattle Powder Co.1
- Elsie Bleeker1
- F. E. Bucklin Co.1
- F. G. Karg1
- Fairyfoot Products Co.1
- Flanders-Day Co.1
- Forest City Products, Inc., Cleveland, Ohio1
- Frank E. Moore and L. Virginia Moore, individuals trading as copartners under the firm name Hilltop Farm Feed Co., at Minneapolis, Minn.1
- Frank Tibbetts and Nancy Tibbetts, the latter owning and operating a business under the firm name of Vitolectic Food Co., Providence, R. I.1
- Franklin A. Fink, trading as the Hertford Co., Minneapolis, Minn.1
- Frenco Laboratories1