AT239BAT239DAAT239BAT 239 BAT239 BAT 239BAT 239D AAT239D AAT 239DAAT 239 BAT239 BAT 239B
Authority
AT
Austria
Application number
Inventor
Thomas Alva Edison
Charles M Johnson
Original Assignee
Thomas Alva Edison
Charles M Johnson
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 Thomas Alva Edison, Charles M JohnsonfiledCriticalThomas Alva Edison
Application grantedgrantedCritical
Publication of AT239BpublicationCriticalpatent/AT239B/de