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 Langdon Davies Walter, Alfred Soames, De Nl Thermo Telephoon Mij NvfiledCriticalLangdon Davies Walter
Publication of CH76724ApublicationCriticalpatent/CH76724A/fr