# Relationship history for MSHA mine 1507309

Current hierarchy: **Bishop George → Bishop Coal Company Inc → No 2**

- 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:** B T R Coal Company → No 2; 1974-09-04 to 1975-01-20; source msha-controller-operator-history
- **controller_controls_mine:** B T R Coal Company → No 2; 1974-09-04 to 1975-01-20; source msha-controller-operator-history
- **controller_controls_operator:** B T R Coal Company → B T R Coal Company; 1974-09-04 to 1975-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Road Fork Coal Company → No 2; 1975-01-21 to 1975-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Road Fork Coal Company → No 2; 1975-01-21 to 1975-09-24; source msha-controller-operator-history
- **controller_controls_operator:** Road Fork Coal Company → Road Fork Coal Company; 1975-01-21 to 1975-09-24; source msha-controller-operator-history
- **operator_operates_mine:** Adkins & Tackett Coal Company → No 2; 1975-09-25 to 1976-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Morgan Dean & Bruce Tackett → No 2; 1975-09-25 to 1976-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Morgan Dean & Bruce Tackett → Adkins & Tackett Coal Company; 1975-09-25 to 1976-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Red Top Coal Company Inc → No 2; 1976-07-19 to 1982-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Charles Robert T → No 2; 1976-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles Robert T → Red Top Coal Company Inc; 1976-07-19 to 1982-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Bishop George → No 2; 1981-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bishop Coal Company Inc → No 2; 1982-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bishop George → Bishop Coal Company Inc; 1982-03-10 to current/open; source msha-controller-operator-history