sentences:  The type was supplied to the Belgian and the Italian air forces, with whom it proved highly successful.Of a total of about 1,200 examples built, 831 were produced by Italian companies under licence.The Hanriot company produced a series of pioneering monoplanes pre-war but had settled down as a licence manufacturer, notably of Sopwith 1½ strutters, when the HD.1 was produced in 1916.