Artifact Details Title Marbel Blood-Cell Calculator Catalog Number 102662735 Type Physical object Description Plate on front of object reads, "MARBEL BLOOD-CELL CALCULATOR PERCENTAGE CALCULATOR FOR DIFFERENTIAL BLOOD FILMS ADDING MACHINE FOR ERYTHROCYTES, LEUCOCYTES, BLOOD PLATELETS". Date 1922 ca. Manufacturer The Marbel Blood Calculator Co. Identifying Numbers Model number VI-T Other number JUNE 6, 1922 Patent date Serial number 18694 Dimensions overall: 3 1/4 in x 11 1/2 in x 3 3/4 in Category Calculator/mechanical Credit Gift of Warren Yogi Lot Number X3984.2007
