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
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Application filedfiledCritical
Priority to NL6706873ApriorityCriticalpatent/NL6706873A/xx
Priority to GB1228787Dprioritypatent/GB1228787A/en
Priority to CH711968Aprioritypatent/CH489184A/de
Priority to BE715107Dprioritypatent/BE715107A/xx
Priority to CH692669Aprioritypatent/CH506933A/de
Priority to IE58068Aprioritypatent/IE31909B1/xx
Priority to DE19681757486prioritypatent/DE1757486C2/de
Priority to FR1565906Dprioritypatent/FR1565906A/fr
Publication of NL6706873ApublicationCriticalpatent/NL6706873A/xx