# Relationship history for MSHA mine 4608088

Current hierarchy: **Brock Mining Inc → Brock Mining Inc → Brock No 3**

- 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:** Ashland Inc et al → Brock No 3; 1989-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Red River Valley Coal Company → Brock No 3; 1991-08-01 to 1992-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Red River Valley Coal Company; 1991-08-01 to 1992-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Brock Mining Inc → Brock No 3; 1992-09-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Casa Loma Coal Company Inc → Brock No 3; 1992-10-13 to 1993-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Anthony C → Brock No 3; 1992-10-13 to 1993-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Anthony C → Casa Loma Coal Company Inc; 1992-10-13 to 1993-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Justin Energy Inc → Brock No 3; 1993-08-02 to 1995-07-12; source msha-controller-operator-history
- **controller_controls_mine:** C Greg  Cline → Brock No 3; 1993-08-02 to 1996-05-20; source msha-controller-operator-history
- **controller_controls_operator:** C Greg  Cline → Justin Energy Inc; 1993-08-02 to 1995-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Blue River Coal Company Inc → Brock No 3; 1995-07-13 to 1996-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Prater Billy James → Brock No 3; 1995-07-13 to 1996-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Prater Billy James → Blue River Coal Company Inc; 1995-07-13 to 1996-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Brock Mining Inc → Brock No 3; 1996-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brock Mining Inc → Brock Mining Inc; 1996-02-05 to current/open; source msha-controller-operator-history