| Standard Chain Co |
Braddock |
-- |
| Standard Steel Spring |
Coraopolis |
-- |
| Star Iron Works |
PittsburghNorth Side |
-- |
| Star Tin Plate Co./Star Works, American Sheet & Tin Plate Co/Carnegie Steel Co./US Steel |
PittsburghStrip District |
-- |
| Stella Stove Works |
PittsburghStrip District |
-- |
| Sterling Steel Foundry Co. |
Braddock |
-- |
| Sterrott-Thomas Foundry Co. |
PittsburghStrip District |
-- |
| Structural & Sheet Iron Works |
Oakmont |
-- |
| Superior Furnaces |
PittsburghNorth Side |
-- |
| Superior Steel Co. |
Carnegie |
-- |
| Tippins Inc. |
Etna |
-- |
| Totten & Hogg Iron & Steel Foundry |
PittsburghStrip District |
-- |
| Townsend Steel/Col-Fin Specialty Steel |
Fallston |
-- |
| Tube City Iron & Metal Co. |
Glassport |
-- |
| Union Electric Steel Corp. |
Carnegie |
726 Bell Avenue
Carnegie, PA 15106-1137 |
| Union Furnace |
|
-- |
| Union Malleable Iron Works |
PittsburghNorth Side |
-- |
| Union Mills, Carnegie Steel Co. |
PittsburghLawrenceville |
-- |
| Union Steel Casting Co., Blaw-Knox |
PittsburghLawrenceville |
-- |
| Union Switch & Signal Co. Foundries |
Swissvale |
-- |
| United Engineering & Foundry Co. |
|
-- |
| United Engineering & Foundry Co. |
PittsburghLawrenceville |
-- |
| United States Iron & Tin Plate Works |
McKeesport |
-- |
| Universal Cyclops |
Bridgeville |
-- |
| Universal Stainless |
Bridgeville |
600 Mayer Street
Bridgeville, PA 15017 |
| Vagle Foundry & Machine Co./Lawrence Steel Casting Co. |
PittsburghStrip District |
-- |
| Vandergrift Works, Apollo Iron & Steel/US Steel/Allegheny Ludlum |
Vandergrift |
130 Lincoln Avenue
Vandergrift, PA 15690-1249
|
| Verona Tool Works |
Verona |
-- |
| Vesuvius Rolling Mill/Vesuvius Iron Works/Vesuvius Iron & Nail Works |
Etna |
-- |
| Vulcan Iron Works/Lockhart Iron & Steel |
McKees Rocks |
-- |
