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
Publication date
Application filed by Albert Beale, Henry Selby Hele-ShawfiledCriticalAlbert Beale
Application grantedgrantedCritical
Publication of DK38847CpublicationCriticalpatent/DK38847C/en