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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.)
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Priority claimed from US698384Aexternal-prioritypatent/US2579732A/en
Priority claimed from US760180Aexternal-prioritypatent/US2579733A/en
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Publication of BE492702ApublicationCriticalpatent/BE492702A/fr