# Relationship history for MSHA mine 4402067

Current hierarchy: **Wesley D.  Burke → Burke Coal Company Inc → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mink Gap Coal Company → No 1 Strip; 1950-01-01 to 1977-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Howard → No 1 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Howard → Mink Gap Coal Company; 1950-01-01 to 1977-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Burke Coal Company Inc → No 1 Strip; 1977-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wesley D.  Burke et al → No 1 Strip; 1977-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wesley D.  Burke et al → Burke Coal Company Inc; 1977-10-06 to current/open; source msha-controller-operator-history