00843nam a22002417a 4500 13966 13966 INP 20260622100121.0 180122s1970 ua ||fr|||| 00| 0 ara d EG-INP ara EG-INP 338.9 م.ذ 21 omar, ahmed. on the maintance of a system of machines by one repairman / ahmed omar ; the institute of national planning. cairo : the institute of national planning, 1970. 11 p. ؛ 27 سم. External notes ; 953. the maintance. qrmak 4347 system of machines. qrmak 4321 repairman. EGPV3 original 0 INP INP EN 0 INP INP EN