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Priority to DE19712120511priorityCriticalpatent/DE2120511C/de
Priority claimed from DE19712120511external-prioritypatent/DE2120511C/de
Priority to GB1133972Aprioritypatent/GB1376366A/en
Priority to US00247273Aprioritypatent/US3760849A/en
Priority to SE7205462Aprioritypatent/SE391202B/xx
Publication of DE2120511A1publicationCriticalpatent/DE2120511A1/de
Application grantedgrantedCritical
Publication of DE2120511CpublicationCriticalpatent/DE2120511C/de