# Relationship history for MSHA mine 1519227

Current hierarchy: **Cary Wade  Ahart → Ahart Gravel and Sand → Ahart's Hauling**

- 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:** Ahart Gravel and Sand → Ahart's Hauling; 2008-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Debbie F  Ahart → Ahart's Hauling; 2008-05-01 to 2022-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Debbie F  Ahart → Ahart Gravel and Sand; 2008-05-01 to 2022-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Cary Wade  Ahart → Ahart's Hauling; 2022-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cary Wade  Ahart → Ahart Gravel and Sand; 2022-12-08 to current/open; source msha-controller-operator-history