The offices of the Central Social Institution of Prague, Czechoslovakia. April 1937 “The offices of the Central Social Institution of Prague, Czechoslovakia with the largest vertical letter file in the world. Consisting of cabinets arranged from floor to ceiling tiers covering over 4000 square feet containing over 3000 drawers 10 feet long. It has electric operated elevator desks which rise, fall and move left or right at the push of a button. to stop just before drawer desired. The drawers also open and close electronically. Thus work which formerly taxed 400 workers is now done by 20 with a minimum of effort. Ref: B196_095071_3660 Date: 26.04.1937 Compulsory Credit: UPPA/Photoshot”