This circuit was found in an American 1980s documentation. It analyzes the exhaust gas of a vehicle using a special sensor. The indicator is a milliamperimeter.
Circuits similar to this can be found in this section. This is from 1967 General Electric...
May 2017 - Mouser Electronics announces the availability of the new Murata SCA3300-D01 3-axis...
This circuit was suggested by General Electric in a 1965 documentation. The circuit can be...