Ernst Kottmann
Ernst Kottmann took charge of the Langendorf Watch Company factory in 1899.
Ernst Kottmann was a member of the Comité Central of the Chamber Suisse de l'Horlogerie in 1901 and 1904.
Ernst Kottmann took charge of the Langendorf Watch Company factory in 1899.
Ernst Kottmann was a member of the Comité Central of the Chamber Suisse de l'Horlogerie in 1901 and 1904.