Hercules Incorporated (American, 20th Century)

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

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

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

Hercules Incorporated (American, 20th Century)

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

Hercules Incorporated (American, 20th Century)

International Business Machines Corporation (American, 20th Century)

Beckman Instruments (American, 20th Century)

Anonymous

Hercules Incorporated (American, 20th Century)

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

Beckman Instruments (American, 20th Century)

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