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Anita Mark 12: Innards 3(6)

Detail One digit of the display

One digit of the display. Visible: 4 pairs of transistors, make 4 Flip-Flops. In addition 10 transistors, the cathode drivers for the Nixie tubes. Price question: Where is the BCD-to-Decimal-decoder? The SN-74141 did not exist yet at that time.

ringcounter below display block

Below the upright posed display block: A ring counter built from cold cathode relay tubes (Thyratrons).

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