DataInventory Number: HYD20Date: c.1930Maker: Pestalozzi Frobel Verlag, LeipzigInstrument Categories: Hydrostatics / HydrodynamicsDemonstration apparatus PlacesLocation: 26ο Γενικό Λύκειο Αθηνών - 26th High School of Athens Origin: 2ο Γυμνάσιο Θηλέων Αθηνών - Second Gymnasium for girls, Athens