Abstract: Improved devices for making electrical terminal and wire-to-wire connections; in terminal type connections, improved devices for physically and electrically joining one or more electricity-conducting wires to novel terminal constructions; in wire-to-wire connections, novel improved devices for electrically and physically connecting together two or more electricity-conducting wires; wire receiving sleeve members adapted to cooperate with novel electrical terminals or other, like sleeve members and a terminal interconnection therebetween, for purposes of new advantageous physical and electrical connections of wires or wires and terminal members; means for removably locking together the connected parts of such electrical terminal and wire to wire connections.