Harp designs electronic device cabinets and test systems, and carries out the mechanical design of unit-based electronic systems (LRU / Line Replaceable Unit) and cards/modules (SRU / Shop Replaceable Unit). Vikilit® wedge locks physically integrate electronic cards into the unit in which they are fitted. These locks serve as the physical interface between the card and the unit, and help combat environmental factors. By enhancing the electronic card's resistance to vibration and shock, the card locks also facilitate heat dissipation from the card through conduction cooling.