# Relationship history for MSHA mine 4601397

Current hierarchy: **Massey Energy Company → Dehue Coal Company → Dehue Mine**

- 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:** Youngstown Mines Corp → Dehue Mine; 1950-01-01 to 1979-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Lykes Resources Inc → Dehue Mine; 1950-01-01 to 1979-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Lykes Resources Inc → Youngstown Mines Corp; 1950-01-01 to 1979-07-18; source msha-controller-operator-history
- **controller_controls_mine:** LTV Corporation → Dehue Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jones & Laughlin Steel Corp → Dehue Mine; 1979-07-19 to 1982-05-20; source msha-controller-operator-history
- **controller_controls_operator:** LTV Corporation → Jones & Laughlin Steel Corp; 1979-07-19 to 1982-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Dehue Coal Company → Dehue Mine; 1982-05-21 to 1984-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Sidney R  Young III → Dehue Mine; 1982-05-21 to 1984-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Sidney R  Young III → Dehue Coal Company; 1982-05-21 to 1984-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Dehue Mine; 1984-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dehue Coal Company → Dehue Mine; 1984-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Dehue Coal Company; 1984-11-20 to current/open; source msha-controller-operator-history