# Relationship history for MSHA mine 2901909

Current hierarchy: **Autrey Emmitt → Quad Company → Harris Pit**

- 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:** Autrey Emmitt → Harris Pit; 1980-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quad Company → Harris Pit; 1983-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Autrey Emmitt → Quad Company; 1983-03-01 to current/open; source msha-controller-operator-history