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

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

Hercules Incorporated (American, 20th Century)

Anonymous

Jon Whitcomb (American, 1906–1988)

Hercules Incorporated (American, 20th Century)

Willy Pogany (Hungarian, 1882 – 1955)

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

Beckman Instruments (American, 20th Century)

Anonymous

Beckman Instruments (American, 20th Century)

Neysa McMein (American, 1888-1949)

Hercules Incorporated (American, 20th Century)

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

Hercules Incorporated (American, 20th Century)