# Relationship history for MSHA mine 4000657

Current hierarchy: **Campbell Ernest → Ten-Al Coal Company Inc → Ten-Al No 3 Mine**

- 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:** Campbell Ernest → Ten-Al No 3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Orange & Campbell Coal Company → Ten-Al No 3 Mine; 1950-01-01 to 1976-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Orange Pascal → Ten-Al No 3 Mine; 1950-01-01 to 1976-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Orange Pascal → Orange & Campbell Coal Company; 1950-01-01 to 1976-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Loys Layne Coal Company → Ten-Al No 3 Mine; 1976-12-14 to 1978-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Layne Loys → Ten-Al No 3 Mine; 1976-12-14 to 1978-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Layne Loys → Loys Layne Coal Company; 1976-12-14 to 1978-05-01; source msha-controller-operator-history
- **operator_operates_mine:** James Orange Coal Company → Ten-Al No 3 Mine; 1978-05-02 to 1978-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Orange James E → Ten-Al No 3 Mine; 1978-05-02 to 1978-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Orange James E → James Orange Coal Company; 1978-05-02 to 1978-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Ten-Al Coal Company Inc → Ten-Al No 3 Mine; 1978-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Ernest → Ten-Al Coal Company Inc; 1978-06-30 to current/open; source msha-controller-operator-history