O. T. Societe Anonyme Pour L'exploitation Des Brevets Descalles D.
Original Assignee
D O T Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by D O T SafiledCriticalD O T Sa
Publication of CH71004ApublicationCriticalpatent/CH71004A/fr