# Relationship history for MSHA mine 1510303

Current hierarchy: **Andulain Elmo--Kenneth Cromer & Guy C Martin → Goodwill Coal Company → Wolfe Creek Surface**

- 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

- **operator_operates_mine:** Goodwill Coal Company → Wolfe Creek Surface; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andulain Elmo--Kenneth Cromer & Guy C Martin → Wolfe Creek Surface; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andulain Elmo--Kenneth Cromer & Guy C Martin → Goodwill Coal Company; 1977-03-01 to current/open; source msha-controller-operator-history