# Relationship history for MSHA mine 1518751

Current hierarchy: **Harvie  Gay; Randall  Gay → H & R Coal Company → Mine 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:** H & R Coal Company → Mine No 1; 2004-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randall  Gay et al → Mine No 1; 2004-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall  Gay et al → H & R Coal Company; 2004-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvie  Gay et al → H & R Coal Company; 2004-04-27 to current/open; source msha-controller-operator-history