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 are the physical interface between the card and the unit, and play a role in combating environmental factors. Increasing the resistance of the electronic card to vibration and shock, the card locks contribute to the dissipation of heat from the card through conduction cooling.