Having two threaded end parts connected by a threaded central part with

Official title: {having two threaded end parts connected by a threaded central part with opposite threads at its opposite ends, i.e. for adjusting the distance between both end parts by rotating the central part}

A61F2002/30411 (Having two threaded end parts connected by a threaded central part with) appears on 320 US grants and 358 published applications in this corpus.