# Relationship history for MSHA mine 4002738

Current hierarchy: **Daugherty Leona → Ken Ray Coal Company Inc → #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:** Gipson Coal Company → #1; 1981-08-01 to 1982-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Gipson James M → #1; 1981-08-01 to 1982-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Gipson James M → Gipson Coal Company; 1981-08-01 to 1982-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Valuable Energy Coal Company → #1; 1982-09-14 to 1984-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Vance Clell P Et Al → #1; 1982-09-14 to 1984-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Vance Clell P Et Al → Valuable Energy Coal Company; 1982-09-14 to 1984-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Plateau Mining Corp → #1; 1984-02-28 to 1987-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Frank → #1; 1984-02-28 to 1987-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Frank → Plateau Mining Corp; 1984-02-28 to 1987-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Daugherty Leona Et Al → #1; 1984-06-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ken Ray Coal Company Inc → #1; 1987-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daugherty Leona Et Al → Ken Ray Coal Company Inc; 1987-07-13 to current/open; source msha-controller-operator-history