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The Schlumberger company then tried to expand their activities to many other countries, but the attempts were hindered by the worldwide depression. On 15 September 1934, Schlumberger's subsidiary in the United States became Schlumberger Well Surveying Corporation (SWSC) with offices in Houston, Texas. Conrad was the chairman, and Marcel was the ...

Gustave Schlumberger. Léon Gustave Schlumberger (17 October 1844 – 9 May 1929) was a French historian and numismatist who specialised in the era of the crusades and the Byzantine Empire. His Numismatique de l'Orient Latin (1878–82) is still considered the principal work on the coinage of the crusades. He was awarded the medal of the Royal ...

William Schlumberger (1800 – April 1838) was a European chess master. He is known to have taught Pierre Charles Fournier de Saint-Amant to play chess and as the operator of The Turk , a chess-playing machine which was purported to be an automaton .

Pierre Schlumberger was born in 1914, the son of Marcel Schlumberger, a mechanical engineer, and his wife Jeanne Laurans. Marcel co-founded Schlumberger in the 1920s with his brother, Conrad, a physicist. Pierre was the brothers' only male heir.