# Relationship history for MSHA mine 1514319

Current hierarchy: **Moreland Frank T → Tygart Creek Coal Company Inc → No 1 Auger**

- 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:** Moreland Frank T → No 1 Auger; 1979-01-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tygart Creek Coal Company Inc → No 1 Auger; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moreland Frank T → Tygart Creek Coal Company Inc; 1983-11-01 to current/open; source msha-controller-operator-history