# Relationship history for MSHA mine 1506975

Current hierarchy: **Howell Joe Jr → Evan Coal Company Inc → No 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:** J H Coal Company → No 1; 1974-01-01 to 1977-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Price Jack C → No 1; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Price Jack C → J H Coal Company; 1974-01-01 to 1977-07-19; source msha-controller-operator-history
- **operator_operates_mine:** B & G Coal Company → No 1; 1977-07-20 to 1981-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Bobby → No 1; 1977-07-20 to 1981-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Bobby → B & G Coal Company; 1977-07-20 to 1981-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Adkins William → No 1; 1980-02-01 to 1984-07-15; source msha-controller-operator-history
- **operator_operates_mine:** A D D Coal Company Inc → No 1; 1981-10-26 to 1984-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Adkins William → A D D Coal Company Inc; 1981-10-26 to 1984-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Evan Coal Company Inc → No 1; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howell Joe Jr → No 1; 1984-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howell Joe Jr → Evan Coal Company Inc; 1984-07-16 to current/open; source msha-controller-operator-history