# Relationship history for MSHA mine 1514259

Current hierarchy: **Eagle Coal & Dock Company Inc → Somerset Coal Company → Somerset No 3 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

- **controller_controls_mine:** Eagle Coal & Dock Company Inc → Somerset No 3 Mine; 1981-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Somerset Coal Company → Somerset No 3 Mine; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Coal & Dock Company Inc → Somerset Coal Company; 1983-09-01 to current/open; source msha-controller-operator-history