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Lacking[change source]

  1. Reference for DYK hook.
  2. References for major claims (none of which I doubt as facts).
  3. Explanation for its use in clocks is obscure/non-existent.

Many of these reflect defects in the enWP article, but here everything needs to be spelled out. Macdonald-ross (talk) 06:47, 9 August 2010 (UTC)