# Relationship history for MSHA mine 1519538

Current hierarchy: **David A  Wright → Ridgeline Coal, LLC → Job 5**

- 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:** James T  Stephens  et al → Job 5; 2008-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David A  Wright → Job 5; 2008-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blackstone Coal Company LLC → Job 5; 2010-10-04 to 2016-08-25; source msha-controller-operator-history
- **controller_controls_operator:** James T  Stephens  et al → Blackstone Coal Company LLC; 2010-10-04 to 2016-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Alexander  et al → Blackstone Coal Company LLC; 2010-10-04 to 2016-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Ridgeline Coal, LLC → Job 5; 2016-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Wright → Ridgeline Coal, LLC; 2016-08-26 to current/open; source msha-controller-operator-history