Dow Chemical Company (American, 19th/20th Century)

Jon Whitcomb (American, 1906–1988)

Anonymous

Dow Chemical Company (American, 19th/20th Century)

Beckman Instruments (American, 20th Century)

Beckman Instruments (American, 20th Century)

Hercules Incorporated (American, 20th Century)

International Business Machines Corporation (American, 20th Century)

Hercules Incorporated (American, 20th Century)

Dow Chemical Company (American, 19th/20th Century)

Anonymous

Dow Chemical Company (American, 19th/20th Century)

Hercules Incorporated (American, 20th Century)

Hercules Incorporated (American, 20th Century)