The above aim is achieved by means of a device that comprises {HEAD ~ an arm} consisting of {TAIL ~ a number} of consecutive segments fixed with one of its ends, to a first pivot protruding from a structure and made revolving so to bring about the oscillation of the arm 
The above aim is achieved by means of a device that comprises { HEAD ~ an arm } consisting of { TAIL ~ a number } of consecutive segments fixed with one of its ends , to a first pivot protruding from a structure and made revolving so to bring about the oscillation of the arm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH