# Relationship history for MSHA mine 4202789

Current hierarchy: **Ellis  Brown; Morgan A  Brown → Brown Brothers Construction → Wash Plant 2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Charles A  Brown  et al → Wash Plant 2; 1984-02-01 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Morgan A  Brown et al → Wash Plant 2; 2021-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown Brothers Construction → Wash Plant 2; 2025-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morgan A  Brown et al → Brown Brothers Construction; 2025-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellis  Brown et al → Brown Brothers Construction; 2025-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles A  Brown  et al → Brown Brothers Construction; 2025-08-19 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Ellis  Brown et al → Brown Brothers Construction; 2025-08-19 to 2021-06-30; source msha-controller-operator-history