Fecha de publicación: 05/07/1994 Fuente: WIPO "royal jelly" A rotationally-driven piston used as an extractor for recovering bee's royal jelly in the use of which a mixture of lavre and royal jelly is expelled by centrifugal force against a lavre-removal screen which results in only the royal jelly continuing therethrough to a surrounding piston chamber wall, from which the royal jelly is then scraped during manual movement of a piston head axially of the piston chamber.