Actually I have old digital frequency counter from 70-ties, which is
still working fine and is even getting used sometimes, since my
pic-based counter is not finished:)
Nice tool, built completely on discrete components, no IC's. Nixie
indicators, even some kind of connector for remote control.
A bit frightening to see _that_ amount of cards inside, full of diodes
and transistors.
There is temperature controlled heated, insulated frequency source for
better stability.

-- 
KPL
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