Cold-cathode Indicator Tubes Application Notes, 1972
Components ITT
available on request

E1T Decade Counter Tube
Philips Electronic Tube Division
available on request

A Decade counter for high counting rates
A.J.W.M. van Overbeek, J.L.H. Jonker and K. Rodenhuis
Philips Technical Review, vol. 14, no. 11, May 1953, pp. 313-344
available on request

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