Original Patent - Alfred Oehler in Aarau , Schweiz , 1880 , Steuerhahn an Locomotiven !!!

Original Patent - Alfred Oehler In Aarau , Schweiz , 1880 , Steuerhahn An Locomotiven  !!! - Aarau
Original Patent - Alfred Oehler In Aarau , Schweiz , 1880 , Steuerhahn An Locomotiven  !!! - Aarau
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