All the racing reports from pre-1900 automobile racing show the make De Dietrich (or de Dietrich). The company, named "De Dietrich & Cie." was founded in 1884 by Jean de Dietrich (in fact, my namesake... ).
Then racing reports from the following decades indicated the make as "Lorraine-Dietrich". The company name was "Société Lorraine des Anciens Etablissements de Dietrich et Cie de Lunéville".
Did the two companies merge at a certain moment (and, if yes, when?) or the marque must be listed as "Lorraine-Dietrich" since the first starts of their cars in late 1890s? and the "de Dietrich" version is incorrect/incomplete?