# Relationship history for MSHA mine 1514073

Current hierarchy: **Smith Mark A → New Market Coal Company → Rough Creek Underground**

- 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:** New Market Coal Company → Rough Creek Underground; 1983-06-01 to 1984-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Workman Joe & Wendell Bennett → Rough Creek Underground; 1983-06-01 to 1984-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Workman Joe & Wendell Bennett → New Market Coal Company; 1983-06-01 to 1984-12-30; source msha-controller-operator-history
- **operator_operates_mine:** New Market Coal Company → Rough Creek Underground; 1984-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Mark A → Rough Creek Underground; 1984-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Mark A → New Market Coal Company; 1984-12-31 to current/open; source msha-controller-operator-history