Computers and people professionals that preserve, troubleshoot, program, administer, network, and build them are central to most every industry. The Selective Sequence Electronic Calculator (SSEC) project, led by IBM engineer Wallace Eckert, uses both relays and vacuum tubes to course of scientific data on the rate of 50 14 x 14 digit multiplications per second. Before its decommissioning in 1952, the SSEC produced the moon position tables utilized in early planning of the 1969 Apollo XII moon touchdown. These tables were later confirmed by utilizing more trendy computers for the precise flights. The SSEC was one of the final of the technology of ‘super calculators’ to be constructed using electromechanical expertise.