# Relationship history for MSHA mine 4300806

Current hierarchy: **Douglas  Leach; Estella  Leach → Doug Leach Excavation Inc → Leach Farm Pit**

- 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:** Doug Leach Excavation Inc → Leach Farm Pit; 2021-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Estella  Leach et al → Leach Farm Pit; 2021-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estella  Leach et al → Doug Leach Excavation Inc; 2021-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Leach et al → Doug Leach Excavation Inc; 2021-05-10 to current/open; source msha-controller-operator-history