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A condensing air pump
ARP23A15_340

A condensing air pump

A miniature diving bell, showing how a condensing pump can supply air to an inverted vessel surrounded by water, the excess air escaping as bubbles from the bottom
ARP23A15_335

A miniature diving bell, showing how a condensing ...

Air Raid Precautions: Set of 50 cards issued by WD & H0 Wills, Britain 1938
ARP07097_390002284

Air Raid Precautions: Set of 50 cards issued by WD...