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Keywords: Senator John Heinz History Center - IMG 7812.JPG Exhibit in the Senator John Heinz History Center 1212 Smallman Street Pittsburgh Pennsylvania USA There were no restrictions on photography in the museum collections Aluminum nodules produced by Charles Martin Hall in 1886 using an electrolytic process which formed the basis of the Aluminum Company of America Alcoa I took this photograph 2010-12-02 16 24 21 Daderot Public domain Senator John Heinz History Center Charles Martin Hall Alcoa |