This type of logic is no longer used today. The circuit is from an old American publication and the integrated circuit is uncommon today. Diodes are general-purpose tpes.
We found this circuit in a 1980s American documentation. The operational amplifiers of the...
Two inverters of a 4069B type CMOS integrated circuit form this oscillator which is characterized by having...
Taken from the 1982 SGS manual on integrated circuits, this preamplifier was used in commercial...