# Relationship history for MSHA mine 1507154

Current hierarchy: **Hughes Curtis → Magnum Quality Coal Company Inc → No 6**

- 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:** Quality Coal Company Inc → No 6; 1974-02-01 to 1985-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Collins Jean → No 6; 1974-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Jean → Quality Coal Company Inc; 1974-02-01 to 1985-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Quality Coal Company Inc → No 6; 1985-04-23 to 1986-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Jim → No 6; 1985-04-23 to 1986-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Jim → Magnum Quality Coal Company Inc; 1985-04-23 to 1986-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Quality Coal Company Inc → No 6; 1986-02-03 to 1987-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Collett Lucky → No 6; 1986-02-03 to 1987-06-24; source msha-controller-operator-history
- **controller_controls_operator:** Collett Lucky → Magnum Quality Coal Company Inc; 1986-02-03 to 1987-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Quality Coal Company Inc → No 6; 1987-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Curtis → No 6; 1987-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Curtis → Magnum Quality Coal Company Inc; 1987-06-25 to current/open; source msha-controller-operator-history