This circuit is from American documentation from the 1980s. The transistors are general purpose types and the relay can be 6 or 12 V depending on the supply voltage.
This is a configuration widely used for oscillators with crystal from 1 to 20 MHz typically. The...
This circuit includes the power supply from the power grid. We found it in Radio Electronics from...
This circuit with transistors and a crystal microphone appeared in Radio Electronics magazine in...