# Relationship history for MSHA mine 4404542

Current hierarchy: **Addair Stuart → A & B 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:** Boshell Coal Company → No 2; 1976-11-01 to 1978-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Boshell Harry E → No 2; 1976-11-01 to 1978-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Boshell Harry E → Boshell Coal Company; 1976-11-01 to 1978-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Addair Stuart → No 2; 1978-09-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boshell Coal Company → No 2; 1978-10-28 to 1979-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Hibbitts David E → No 2; 1978-10-28 to 1980-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Hibbitts David E → Boshell Coal Company; 1978-10-28 to 1979-06-11; source msha-controller-operator-history
- **operator_operates_mine:** A & B Coal Company Inc → No 2; 1979-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Addair Stuart → A & B Coal Company Inc; 1979-06-12 to current/open; source msha-controller-operator-history