| 21. | The first commercial atomic clock was the Atomichron, manufactured by the National Company.
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| 22. | A number of other atomic clock schemes are in use for other purposes.
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| 23. | :: : : Note that GPS satellites do carry atomic clocks.
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| 24. | The line of watches now includes atomic clock synchronization and Tough Solar functionality.
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| 25. | This work has led to advances in spectroscopy, atomic clocks and quantum information.
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| 26. | Not the desire to knock Coughlin's atomic clock off or his petty rules.
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| 27. | The clock uses about one-tenth the power of other atomic clocks.
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| 28. | An atomic clock uses an atomic resonance frequency standard as its timekeeping element.
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| 29. | New VCRs program the time automatically, using signals coming in from atomic clocks,
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| 30. | In 1994, the atomic clock was replaced with a newer model.
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