# Relationship history for MSHA mine 1513250

Current hierarchy: **Rhein Thomas J → Triple A Coal Company → No 1 Preparation Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Triple A Coal Company → No 1 Preparation Plant; 1981-12-01 to 1982-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kinney Herb → No 1 Preparation Plant; 1981-12-01 to 1982-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kinney Herb → Triple A Coal Company; 1981-12-01 to 1982-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Triple A Coal Company → No 1 Preparation Plant; 1982-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rhein Thomas J → No 1 Preparation Plant; 1982-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhein Thomas J → Triple A Coal Company; 1982-06-24 to current/open; source msha-controller-operator-history