# Relationship history for MSHA mine 1518544

Current hierarchy: **Mark E  Daugherty → H & Q Coal Inc → #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** James W  Smith → #1; 2000-04-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Millennium Fuels, Inc. → #1; 2002-05-09 to 2004-09-20; source msha-controller-operator-history
- **controller_controls_operator:** James W  Smith → Millennium Fuels, Inc.; 2002-05-09 to 2004-09-20; source msha-controller-operator-history
- **operator_operates_mine:** H & Q Coal Inc → #1; 2004-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin  Hampton → #1; 2004-09-21 to 2006-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin  Hampton → H & Q Coal Inc; 2004-09-21 to 2006-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Mark E  Daugherty → #1; 2006-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark E  Daugherty → H & Q Coal Inc; 2006-04-25 to current/open; source msha-controller-operator-history