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Sounding Lead
John Ericsson, c. 1836 - c. 1860, sounding lead, NG-MC-1018
Model of an Oscillating Pump
anonymous, 1821, demonstration model, NG-MC-646
John Ericsson, c. 1836 - c. 1860, sounding lead, NG-MC-1018
anonymous, 1821, demonstration model, NG-MC-646