This anti-bounce circuit was found in a 1967 US documentation. Modern transistors such as the 2N2222 can be used. The circuit acts as a shield.
In the original application of this circuit, from a 1985 documentation, we have only two entries....
This circuit, found in Texas Instruments documentation from the 90's, provides a voltage reference of...
We found this circuit in a 1982 publication. This source allows an adjustment of the output...