
Laboratoire du calcium français (French, 20th Century)

Laboratoire du docteur Bengué et fils (French, 20th Century)

Hans Rudi Erdt (German, 1883 – 1918)

Thomas Theodor Heine (German, 1867-1948 )

U.S. Information Agency (American, 1953-1999)

Anonymous

Anonymous

Laboratoire des produits Scientia (French, 20th Century)

Wilhelm Schulz (German, 1865-1952)

Lith. Van Geleyn (French, 19th/20th century)

Anonymous

Victor Prouvé (French, 1858-1943)

Anonymous

Anonymous

Anonymous

U.S. Information Agency (American, 1953-1999)

Leo Manso (American, 1914–1993)

Charles Wood (English, 20th Century)

Laboratoires Jacques Logeais (French, 20th Century)

Maynard Dixon (American, 1875–1946)

Albert Guillaume (French, 1873 – 1942)

Maurice Bennett (English, 20th Century)

Leonetto Cappiello (Italian, 1875-1942)

Adolf Friedländer Lith. (German, 19th/20th century)

Ken White (American, 1935–1985)