# Relationship history for MSHA mine 0102955

Current hierarchy: **Joan D  Dobbins → Mountainbrook Coal Company Inc → Mine #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

- **controller_controls_mine:** Studer James K → Mine #2; 1991-11-01 to 1993-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Mountainbrook Coal Company Inc → Mine #2; 1992-06-01 to 1993-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Studer James K → Mountainbrook Coal Company Inc; 1992-06-01 to 1993-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Mountainbrook Coal Company Inc → Mine #2; 1993-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joan D  Dobbins → Mine #2; 1993-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joan D  Dobbins → Mountainbrook Coal Company Inc; 1993-09-24 to current/open; source msha-controller-operator-history