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  1. 1
    A satellite-controlled digital clock /
    Government Document Book
  2. 2
    An earth-based coordinate clock network /
    Government Document Book
  3. 3
    Measurement of time and tests of timepieces.
    Published 1914
    Government Document Book
  4. 4
    Testing of timepieces.
    Published 1941
    Electronic resource (PDF)
    Government Document eBook
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