Enameled metal pneumatic trough with collection bottles, The Oesper Collections in the History of Chemistry, Apparatus Museum, University of Cincinnati
Trough Pneumatic, Polypropylene, Dia 25cm, height 10cm. — Eisco Labs
Lasec Education | Pneumatic Trough
5500-10 Pneumatic Trough Plastic
Reconstruction: Priestley's pneumatic trough and a | Science Museum Group Collection
Pneumatic Trough - Make:
Pneumatic Trough - Hanker Scientific
Pneumatic trough - Wikipedia
Pneumatic Trough, Soda Glass, 12" Diameter, 6" Tall, Concave Base - Ei — Eisco Labs