Secretan was a company based in Paris, France that manufactured telescopes and other scientific instruments. In 1845, MarcSecretan (1804–1867), a Swiss
Lotbinière. From 1840 Martens worked in Lausanne with Samuel Heer and MarcSecretan on making daguerreotypes and on the process. In 1844 Martens was commissioned
International Agency for Research on Cancer. ISBN 978-92-832-1244-7. p3 Secretan B, Straif K, Baan R, Grosse Y, El Ghissassi F, Bouvard V, Benbrahim-Tallaa