# Relationship history for MSHA mine 4608452

Current hierarchy: **Leroy  Stear → Stear Auger Mining Inc → Appalachian Mining 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

- **controller_controls_mine:** Leroy  Stear → Appalachian Mining Auger (1); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stear Auger Mining Inc → Appalachian Mining Auger (1); 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leroy  Stear → Stear Auger Mining Inc; 1994-10-01 to current/open; source msha-controller-operator-history