Show i iI t k 1 s y t t t ELECTRONIC ABACUS Modern mans man's successor to the calculator of the ancients Is inspected by Sergeant J J. J C. C Carman Garman Jr a U. U S. S Air Force Aerospace Defense Command computer maintenance technician The abacus looking abacus looking object is a removable removable able rack from one of the huge computers that are the heart of the nations nation's air defense system Computers Computer's compare known flight plans of all ah craft all craft detected by radar When unknown aircraft appear Interceptors may be scrambled for visual |