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  1. Atomic Clock — 2021-08-20 10:45:05
    …led by atomic or molecular oscillations. Essen joined NPL in 1929 to further his ambition to build highly accurate time pieces. He investigated the potential of tuning forks and quartz crystal oscillators for precise time measurement. His researc…
  2. Meccano — 2017-05-14 01:23:25
    …ughter, Patricia. Hornby began experimenting with ideas in his home workshop making toys for his sons in **1899** with pieces he cut from sheet metal. == Dad and Toys == He built models of bridges, trucks and cranes, although the pieces they we…
    …eth tower" width="300" class="right" }} The key inventive step was when he used regular perforations in the structural pieces that could be used to join them together with nuts and bolts. By the end of 1900 Hornby had built a set of parts he con…

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