| 1 | TWCX | The Wash.-Co. Alfalfa Milling Co. | 8/1920 | | NAKINA |
| 2 | TWCX | Taylor Wharton Cryogenics, a Division of Harsco Corp. | 7/2005 (not listed) | | NAKINA |
| 3 | TWCX | *WASHINGTON COUNTY ALFALFA MILLING CO. | | | PWRC |
| 4 | TWCX | +TW CRYOGENICS, LLC (TAYLOR WHARTON CRYOGENICS, DIV. HARSCO CORP.) | | | PWRC |