# Relationship history for MSHA mine 3303949

Current hierarchy: **Widmor Phillip → Widmor Coal Company → Skoff Strip**

- 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

- **controller_controls_mine:** Widmor Phillip Et Al → Skoff Strip; 1976-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Widmor Coal Company → Skoff Strip; 1985-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Widmor Phillip Et Al → Widmor Coal Company; 1985-03-01 to current/open; source msha-controller-operator-history