I couldn't get the link to work (it just hangs). However, I vaguely remember when we were starting work on the 5071A that the reason why we used the model number 5071A instead of 5070A was that the latter number had been reserved for a hydrogen maser that was never sold. The person in charge of checking out model numbers used to complain about "wasting numbers" and was probably not pleased about this.
Rick Karlquist N6RK On 2/24/2014 8:00 AM, Pete Lancasout hire wrote:
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf pages 8 & 9 -pete
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