# Relationship history for MSHA mine 3100384

Current hierarchy: **Barnhill Contracting Company → Barnhill Contracting Co., SouthEast Division → Apco Pits**

- 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:** Barnhill Contracting Co., SouthEast Division → Apco Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barnhill Contracting Company → Apco Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnhill Contracting Company → Barnhill Contracting Co., SouthEast Division; 1950-01-01 to current/open; source msha-controller-operator-history