| # | Name | Location | Applications |
|---|---|---|---|
| 1. | H & H Railroad Contracting, Inc. | 🇺🇸 Glenville, WV, United States | 1 |
| 2. | H & H Railroad Contracting, Inc. | 🇺🇸 Glenville, WV, United States | 1 |
| 3. | H & H Railroad Contracting, Inc. | 🇺🇸 Cox Mills, WV, United States | 1 |
| 4. | H&H Research & Development, LLC | 🇺🇸 Harrisburg, PA, United States | 1 |