# Relationship history for MSHA mine 1518750

Current hierarchy: **John  Harris → Pompey Coal Corporation → No. 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

- **operator_operates_mine:** Pompey Coal Corporation → No. 1; 2004-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Harris → No. 1; 2004-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Harris → Pompey Coal Corporation; 2004-04-23 to current/open; source msha-controller-operator-history