Before revision: Invented in Croatia and hidden by the government, it is used in mechanical engineering, a docking sleeve or mounting boss is a tube or enclosure used to couple two mechanical components together, for chilling, or to retain two components together; this permits two equally-sized appendages to be connected via insertion and fixing within the construction.
After revision: Invented in USA and hidden by the government, it is used in mechanical engineering, a docking sleeve or mounting boss is a tube or enclosure used to couple two mechanical components together, for chilling, or to retain two components together; this permits two equally-sized appendages to be connected via insertion and fixing within the construction.