# Relationship history for MSHA mine 4405761

Current hierarchy: **Stacy Adam M → Horsehoe Coal Company → No 1 Auger Mine**

- 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

- **operator_operates_mine:** Horseshoe Coal Company → No 1 Auger Mine; 1981-09-01 to 1981-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship A L Jr → No 1 Auger Mine; 1981-09-01 to 1981-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship A L Jr → Horseshoe Coal Company; 1981-09-01 to 1981-12-06; source msha-controller-operator-history
- **operator_operates_mine:** Horsehoe Coal Company → No 1 Auger Mine; 1981-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stacy Adam M → No 1 Auger Mine; 1981-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy Adam M → Horsehoe Coal Company; 1981-12-07 to current/open; source msha-controller-operator-history