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Priority to NL6703450ApriorityCriticalpatent/NL6703450A/xx
Priority to DE19681660630prioritypatent/DE1660630A1/de
Priority to GB1004968Aprioritypatent/GB1197854A/en
Priority to BE711567Dprioritypatent/BE711567A/fr
Priority to FR1555298Dprioritypatent/FR1555298A/fr
Priority to ES351108Aprioritypatent/ES351108A1/es
Publication of NL6703450ApublicationCriticalpatent/NL6703450A/xx