# Relationship history for MSHA mine 1518052

Current hierarchy: **G B  Hendrickson → B & H Coal Company Inc → Auger Mine #22**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** G B  Hendrickson → Auger Mine #22; 1986-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & H Coal Company Inc → Auger Mine #22; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** G B  Hendrickson → B & H Coal Company Inc; 1998-05-01 to current/open; source msha-controller-operator-history