"5 Generations Koechlin Bourcart Schlumberger"
Silhouettes cut out and placed on paper annotated and signed by Nicolas Schlumberger, son and husband of Catherine Bourcart and father of little Emma (6 months old). Work carried out and signed on December 31, 1832 by Nicolas Schlumberger fils who is, if not at the origin of the factory, indisputably the main element of what then becomes Schlumberger & Co 
Le Magazine
Rivista Artiquariato
TRÉSORS magazine