Kuki abahanga mu by'ubwubatsi bw'amabara y'urubura basaba abahanga mu myaka ibarirwa muri za mirongo gukoresha amabara y'urubura?

Ibi biterwa nuko iyo riveti y’imiterere y’icyuma ipfundikiye, mandrel ishobora gufungirwa mu mubiri w’icyuma, bigatuma umubiri w’icyuma n’icyuma bihagarara ku murongo umwe, bigatuma abayikoresha badashobora gufunga. Imbaraga zo gufunga nazo ziyongera icyarimwe. Umutwaro mwinshi uterwa n’imbaraga nyinshi za riveti mandrel ubwayo ifunga mandrel mu mubiri w’icyuma.