This inverter is critical for transformers and can use modern equivalent transistors like MJ2955 on the output. The circuit provides a 115 V sinusoidal voltage with 12 V input.
This shield, found in old English documentation, appears with variations elsewhere in this section...
This complementary or bilateral emitter follower was found in American documentation from the 90s....
This configuration that functions as a zener diode was found in an English publication from 1976....