XTAL oscillator with fine tuning (CB22403E)

We found this circuit in an old English documentation. The integrated circuit is of a specific type of the time.

Second Order Unity Gain Filter (CB25817E)
Using a 741 op-amp this circuit high-pass to 10 kHz was found in the February 1995 issue of...
LASCR tachometer 2 (CB9354E)
Found in 1965 General Electric documentation this circuit applies to a LASCR used as an optical...
Logic Test (CB8911E)
Using transistors and lamps, this simple circuit was found in Popular Electronics. The circuit can...