Edison and his principle assistants at the Menlo Park laboratory, 1879.  Left to right and back to front: T. Seymour, “Basic” Lawson, J.F. Rudolph, George Carmen, F. McLaughlin, J.F. Ott, Dr. Haid, F.R. Upton, Edison, Charles Batchelor, Francis Jehl, Martin N. Force, Albert Swanson, S.L. Griffen.
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