A test tube holder and tray assembly designed for use with a dri-bath incubator. The test tube holder comprises a top shelf which comprises a rigid top plate and a sheet of flexible material secured to the rigid plate having a second plurality of openings which are aligned with the openings in the top...http://www.google.es/patents/US5133939?utm_source=gb-gplus-sharePatente US5133939 - Test tube holder and tray assembly
