# Relationship history for MSHA mine 0103021

Current hierarchy: **Joan D  Dobbins → Mountainbrook Coal Company Inc → Mine 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:** Osborn Nicky Et Al → Mine No 3; 1986-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joan D  Dobbins → Mine No 3; 1993-09-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountainbrook Coal Company Inc → Mine No 3; 1994-06-01 to 1995-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Joan D  Dobbins → Mountainbrook Coal Company Inc; 1994-06-01 to 1995-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Osborn Coal Enterprises Inc → Mine No 3; 1995-08-02 to 1996-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Osborn Nicky Et Al → Osborn Coal Enterprises Inc; 1995-08-02 to 1996-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Mountainbrook Coal Company Inc → Mine No 3; 1996-04-04 to 1997-05-26; source msha-controller-operator-history
- **controller_controls_operator:** Joan D  Dobbins → Mountainbrook Coal Company Inc; 1996-04-04 to 1997-05-26; source msha-controller-operator-history
- **controller_controls_mine:** John C  Fay Jr → Mine No 3; 1996-11-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Highland Mining Company Inc → Mine No 3; 1997-05-27 to 1998-04-15; source msha-controller-operator-history
- **controller_controls_operator:** John C  Fay Jr → Highland Mining Company Inc; 1997-05-27 to 1998-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Mountainbrook Coal Company Inc → Mine No 3; 1998-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joan D  Dobbins → Mountainbrook Coal Company Inc; 1998-04-16 to current/open; source msha-controller-operator-history