[D0204AAO], Telegram from Thomas Alva Edison to Unknown, August 13th, 1902
https://edisondigital.rutgers.edu/document/D0204AAO
Transcription
Cable Aug 13 _ 1902 Satusultra Berlin Germany Impossible to be certain that charged cell has all iron metallic state test results vary according to method manufacture. Claim should be for iron or compound thereof electrolytically oxidizable when charged deoxidizable when discharged Edison