# Relationship history for MSHA mine 1516837

Current hierarchy: **Niece Wilford → Apple Tree Mining Company → No 3**

- 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:** Niece Wilford → No 3; 1982-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Apple Tree Mining Company → No 3; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Niece Wilford → Apple Tree Mining Company; 1990-03-01 to current/open; source msha-controller-operator-history