7-segment display driver (CB20551E)

We found this circuit in English documentation from 1996 for PCs. The circuit is for common cathode display.

Protection for Power Supplies (CB463)
The circuit shown triggers a relay when the current rises up to a value depending on R1 according...
Monostable Using the 4098 [IV] (CB140E)
A fourth version of a non-retriggerable monostable is shown in Figure. It is triggered by the...
Self-powered radio (CB20515E)
We found this circuit in a documentation from the 50's. The transistors are germanium types. The...