# Relationship history for MSHA mine 4801573

Current hierarchy: **Nellie  Searle → Searle Bros. Construction Company → Leucite Mine #11**

- 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:** Nellie  Searle et al → Leucite Mine #11; 1988-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Searle Bros. Construction Company → Leucite Mine #11; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nellie  Searle et al → Searle Bros. Construction Company; 2000-01-01 to current/open; source msha-controller-operator-history