Lettre dactylographiée, signée, tête de lettre imprimée 'From the Laboratory of Thomas A. Edison', àDugald C. Jackson, 28 juillet 1915.
Il le remercie pour sa lettre et affirme que si Congress approuve l'établissement d'un laboratoire expérimental, le 'Massachusets Institue of Technology would be of immense value in working out certain necessary data'. Une page 275 x 211mm.
Dugald C. Jackson (1865-19851), professeur de l'ingénieurie électrique au Massachusets Institue of Technology 1907-1935.
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