Inscrição
PARTE POSTERIOR DA CAIXA: "CECO" / "MICROTITER®" / "COOKE ENGINEERING CO." / "MEDICAL RESEARCH DIVISION" / "900 SLATERS LANE" / "PHONA 703-548-3889" / "ALEXANDRIA, VIRGINIA" / "ZIP - 22314" / "THE PRECISION MICRODILUTORS CONTAINED IN THE PACKAGE ARE COVERED" / "BY ONE OR MORE OF THE FOLLOWING U. S. PATENTS 3,252,331, 3,349,937."/ ".025ml MICRODILUTER® MFG. NO. 220 - 33" / "28 - 3 - 73" (escrito à mão na cor laranja)