IS200TTURH1C is a GE Mark VI series Turbine Control Terminal Board. This circuit board is made to work with the company's subsequent Speedtronic systems. This applies to both the Mark VI and the Mark VIe systems. Both of these systems, as well as components for previous Speedtronic systems, are in stock and ready to ship at WOC. Since the first iteration became available for industrial gas and steam turbine management in the late 1960s, Speedtronic systems have progressively become more complicated.