Courtney, Stephens and Co
of Blackhall Iron Works in Dublin.
c.1865 Built the Drinagh scoop-wheel, to be one of the largest in existence.
Proprietors: William Courtney and William Stephens (dates not specified).
In 1877 they supplied signalling equipment for B&LR (Ballymena & Larne Railway) 
Sources of Information
-  Irish Narrow Gauge - Contractors and Suppliers web page