Speedtronic systems have been used for industrial turbine control since the late 1960s when General Electric released the Mark I

Turbine specific I/O module. It is designed to provide a direct interface to specific turbine field devices.

GE Speedtronic MKVIe gas turbine Control.

Device known as an analog terminal board. This PCB or printed circuit board is a part of the Mark VI series by General Electric. Mark VI and the other series in the Mark lineup by General Electric were created to control and automate the processes of gas and steam turbines.