er 38 and the contacts within the receptacle structure, holes 60 and 62 are provided through which bolts, rivets or other suitableiastening means may be passed in order to complete the receptacle structure. a As better shown in FIG. 1, the plurality of contacts 10, 12, 13, 16, 18, will appear parallelly disposed so that a plurality of similarly disposed male contacts may be inserted into the slot