# Relationship history for MSHA mine 1519074

Current hierarchy: **Stoney D  Grubb → Stone Coal LLC → Stone Coal Auger #1**

- 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:** Stone Coal LLC → Stone Coal Auger #1; 2007-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stoney D  Grubb → Stone Coal Auger #1; 2007-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stoney D  Grubb → Stone Coal LLC; 2007-01-09 to current/open; source msha-controller-operator-history