Demonstration Vacuum Pump, c. 1870
Signed "Sundermann-Zons, Coeln", aerostatical demonstration 
model, with manometer and plate on wooden base, 
including "Magdeburger" hemispheres. 
Size 18 ½ x 12 ¼ x 22 in.
Estimate: € 800/1.500
US$ 1,100/2,000
Reserve: € 300/US$ 405
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