A micro-titre test plate including a thermoplastic incubation tray having an array of a plurality of wells extending therethrough, filter means, and a thermoplastic harvester tray for supporting the filter sheet. The harvester tray has a plurality of apertures therethrough arranged to be registerable...http://www.google.com/patents/US4948442?utm_source=gb-gplus-sharePatent US4948442 - Method of making a multiwell test plate
