His most successful invention ( provisional patent 15 624 ) , a shearing machine that converted curvilineal motion into the straight line movement which is the basis of modern mechanical shears , was introduced without Unaipon receiving any financial return and , apart from a 1910 newspaper report acknowledging him as the inventor , he received no credit .
His most successful invention was a shearing machine ( provisional patent 15 624 ) that converted curvilineal motions into the straight-line movement that is the basis of modern mechanical shears .