Birtley | ROF Chorley | ROF Thorpe Arch | ROF Swynnerton | ROF Glascoed | ROF Bridgend |
Birtley is the home of the Royal Ordnance Factory, ROF Birtley, and the Komatsu Heavy Engineering Company which operates from the previous premises of Birtley Iron Works (1827-, which became premises of the Caterpillar Company in the mid 20th century).