An impeller type pump has a pump body consisting of a front casing and a back casing. Each of the casings comprises a ceramic main portion and a protection member covering the main portion. The protection members of both the main portions are interconnected with each other at their confronting marginal...http://www.google.es/patents/US4099890?utm_source=gb-gplus-sharePatente US4099890 - Impeller type pump having seal means and protective means
Impeller type pump having seal means and protective means
