# Relationship history for MSHA mine 1512161

Current hierarchy: **Weyandt Michael J → American Coal Corp → Lunar**

- 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:** Lunar Corp → Lunar; 1979-12-01 to 1986-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Davis Coals Inc → Lunar; 1979-12-01 to 1986-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Davis Coals Inc → Lunar Corp; 1979-12-01 to 1986-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Tim Doug  Johnson → Lunar; 1984-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chloe Ridge Coal Company Inc → Lunar; 1986-10-21 to 1988-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Tim Doug  Johnson → Chloe Ridge Coal Company Inc; 1986-10-21 to 1988-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Big Creek Collieries Inc → Lunar; 1988-06-03 to 1993-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Dean  Francis → Lunar; 1988-06-03 to 1993-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Dean  Francis → Big Creek Collieries Inc; 1988-06-03 to 1993-10-05; source msha-controller-operator-history
- **operator_operates_mine:** American Coal Corp → Lunar; 1993-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weyandt Michael J → Lunar; 1993-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weyandt Michael J → American Coal Corp; 1993-10-06 to current/open; source msha-controller-operator-history