# Relationship history for MSHA mine 1514133

Current hierarchy: **Witten William D & Blake Ratliff → Magnum Energy → No 1 Surface**

- 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

- **controller_controls_mine:** MAPCO Inc → No 1 Surface; 1978-02-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Toptiki Coal Corp → No 1 Surface; 1983-07-01 to 1984-06-20; source msha-controller-operator-history
- **controller_controls_operator:** MAPCO Inc → Toptiki Coal Corp; 1983-07-01 to 1984-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Energy → No 1 Surface; 1984-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Witten William D & Blake Ratliff → No 1 Surface; 1984-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Witten William D & Blake Ratliff → Magnum Energy; 1984-06-21 to current/open; source msha-controller-operator-history