# Relationship history for MSHA mine 1507351

Current hierarchy: **Tackett Jeromia & Pauline → B J & L 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

- **controller_controls_mine:** Donald Ray  Tackett → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & R Coal Company → No 1; 1974-09-23 to 1978-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Donald Ray  Tackett → D & R Coal Company; 1974-09-23 to 1978-06-20; source msha-controller-operator-history
- **operator_operates_mine:** B J & L Coal Company Inc → No 1; 1978-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Jeromia & Pauline → No 1; 1978-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Jeromia & Pauline → B J & L Coal Company Inc; 1978-06-21 to current/open; source msha-controller-operator-history