Mepụta ụdị nke ahịrịokwu a nke dị mgbagwoju anya Ralph Greenleaf (amụrụ ya na November 3, 1899 na Monmouth, Illinois, nwụrụ na March 15, 1950) bụ onye mmeri ugboro 20 n'egwuregwu Pocket Billiard.
N'ezie, ụdị nkebi ahịrịokwu ahụ dị mgbagwoju anya bụ "Ralph Greenleaf (amụrụ ya na 3 Nọvemba 1899 na Monmouth, Illinois, nwụrụ na 15 Machị 1950) bụ onye ọkpụkpọ egwuregwu bọọlụ ọkachamara nke America, onye mmeri oge iri abụọ nke Pocket Billiards World, onye ikike ya na charisma ya na-achịkwa egwuregwu ahụ n'oge ọ na-eme nke ọma. "