[time-nuts] Absolute time accuracy pre-Cesium?

[John Ackermann N8UR]

Does anyone have a pointer to information about the absolute time 
accuracy (not stability) that was available via PZT or other techniques 
prior to the Cesium definition?  I'm doing a presentation and want to 
show the evolution of accuracy.  My Google-fu has failed me in finding 
anything pre-Atomic.

Thanks!
John

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