Profile: Superior Interlock Corp. is a manufacturer of key interlocks system. Our brand includes Cory Key Interlocks™. Our product line includes transfer interlocks, interlock units for base mounting, interlock units for flat mounting, access interlock unit and panel mount switch interlock. Our compartment door interlocks are manufactured in a number of different types for the interlocking of compartment or cell doors, gates, access hatches, manways, access doors and safety fences.