[time-nuts] Antique precision timing device without, > electronics

[Poul-Henning Kamp]

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In message <338b9eed-8664-3876-afdf-610abc420dd3 at irtelemetrics.com>, Dan Kemppainen writes:

>What the lowest frequency tuning fork oscillator ever built? Was 1Hz 
>ever achieved commercially?

Does flagpoles count ?  :-)

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