# Relationship history for MSHA mine 1515949

Current hierarchy: **Warfield Gary & Jerry → G & M Coal Company → #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:** Elijah Coal Company → #1; 1987-03-01 to 1989-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Riley Ronald Et Al → #1; 1987-03-01 to 1990-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Riley Ronald Et Al → Elijah Coal Company; 1987-03-01 to 1989-05-02; source msha-controller-operator-history
- **operator_operates_mine:** G & M Coal Company → #1; 1989-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Warfield Gary & Jerry → #1; 1989-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warfield Gary & Jerry → G & M Coal Company; 1989-05-03 to current/open; source msha-controller-operator-history