{TAIL ~ A pair} of {HEAD ~ insertion bars} are provided, one being attached to each arm so that when the arms are pivoted into their closed position the bars engage and insert the conductors into their respective contact terminals 
{ TAIL ~ A pair } of { HEAD ~ insertion bars } are provided , one being attached to each arm so that when the arms are pivoted into their closed position the bars engage and insert the conductors into their respective contact terminals
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