# Relationship history for MSHA mine 1002307

Current hierarchy: **Case E  Stedham → Western Construction of Lewiston, Inc → Plant 1**

- 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:** Western Construction of Lewiston, Inc → Plant 1; 2018-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Case E  Stedham → Plant 1; 2018-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Case E  Stedham → Western Construction of Lewiston, Inc; 2018-10-23 to current/open; source msha-controller-operator-history