1 image. New Automatic National Cash Register Class 31 Bookkeeping machine at 7th annual NACA Business Show, 21 April 1954. Miss Barbara Conant -- 10 years. (Handout).; Supplementary material reads: "Southern California Business Show. Sponsored by National Association of Cost Accountants, 731 So. Spring Street, Los Angeles 14, California. April 20, 1954. For Immediate Release! Here at last is a machine that does a giant's work, but so simple that a child can operate it. Pictured is little Miss Barbara Conant at the controls and operating a new automatic National Cash Register Class 31 Bookkeeping Machine at the 7th annual NACA Business Show. Miss Conant, who is 10 years old, is producing with the aid of this simple machine, the very complex State and Federal Social Security Reports. This machine can be converted easily to do other bookkeeping jobs such as sales, accounts payable, cash receipts and inventory control. Twenty-five hundred students and business executives were on hand for yesterday's business show opening. There are on display over fifteen hundred different types of office machines and systems, representing the latest developments in the office equipment industry".