- Burroughs Wellcome Company1
- C. M. Parker1
- Carl Ludwig1
- Carmalt, William Henry (1836-1929)1
- Charles F. Thackeray, Ltd1
- Charles Truax, Greene, and Company1
- Chloride of Silver Dry Cell Battery Company1
- Choquart and Peuchot, Opticiens and Constructeurs1
- Clark, A. P.1
- Clement, D. H. (Whitney Avenue, New Haven, CT)1
- Codman and Shurtleff1
- Codman and Shurtleff Surgical and Dental Instruments1
- Collin1
- D. B. Kagenaar1
- David B. Levy1
- Day, Hilbert F.1
- De Zeng Standard Company1
- DeVilbiss Manufacturing Company1
- DeZeng Standard Company1
- Dewees, William1
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