Deep learning accelerators comparable to GPUs, FPGAs, and more recently TPUs. The Selective Sequence Electronic Calculator (SSEC) challenge, led by IBM engineer Wallace Eckert, uses both relays and vacuum tubes to course of scientific knowledge at the rate of fifty 14 x 14 digit multiplications per second. Earlier than its decommissioning in 1952, the SSEC produced the moon position tables used in early planning of the 1969 Apollo XII moon landing. These tables were later confirmed through the use of extra modern computer systems for the actual flights. The SSEC was one of the final of the generation of ‘tremendous calculators’ to be built using electromechanical know-how.