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.)
Publication of NL16701CpublicationCriticalpatent/NL16701C/xx
Priority claimed from US648647Aexternal-prioritypatent/US1542565A/en
Priority claimed from US654803Aexternal-prioritypatent/US1573924A/en
Priority claimed from US681346Aexternal-prioritypatent/US1533311A/en