
Hans Thoma (German, 1839-1924)

Martin Gerlach (German, 1846-1918)
![Problem… Solution Result… [December]](https://mdl.artvee.com/ft/915290il.jpg)
Hercules Incorporated (American, 20th Century)

David (French, 19th/20th century)

Laboratoires du Salyfrêne (French, 20th Century)

Denis Auguste Marie Raffet (French, 1804-1860)

Herald of Nassau-Vianden (Dutch, 15th Century)

Lawrence W. Ladd (American, active 1865-1895)

Tadeusz Makowski (Polish, 1882-1932)

Adolf Rosenberg (German, 1850 – 1906)

Beckman Instruments (American, 20th Century)

Henry William Bunbury (English, 1750-1811)

Johannes Josephus Aarts (Dutch, 1871-1934)

Leslie Matthew Ward (English, 1851-1922)

James Tingle (English, 1790-1858)

Fedor Grigoryevich Solntsev (Russian, 1801 – 1892)

Adolf Rosenberg (German, 1850 – 1906)

William Nicholson (English, 1872-1949)

Karl Ballenberger (German, 1801-1860)

Emrik & Binger (Dutch, 1857 - 1927)

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

Albert Ilg (Austrian, 1847-1896)

Littauer & Boysen (German, 19th/20th century)

Laboratoires Albert Rolland (French, 20th Century)

André Gill (French, 1840 - 1885)