Always the Unusual

Copyright Duncan Robert Antiques 2008.  E&O E.

Dr. Marbel’s Blood Cell Calculator

 

Percentage calculator for differential blood films. Adding machine for  erythrocytes, leukocytes, blood platelets. Manufactured  by a Chicago company. Patent date June 6, 1922. This  is a manually operated calculator to allow counting  the different types of cells at one time. It  automatically registers the total of all cells. Bears old  sticker of Toronto General Hospital.. Small brass handle on  the clearing control is a  working life replacement. Good  working order..