# Relationship history for MSHA mine 4503835

Current hierarchy: **Todd  Thayer; Kyle  Thayer; Ray  Thayer → Riverbottom Rock → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Riverbottom Rock → Plant 1; 2023-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Thayer et al → Plant 1; 2023-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Thayer et al → Riverbottom Rock; 2023-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle  Thayer et al → Riverbottom Rock; 2023-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Thayer et al → Riverbottom Rock; 2023-07-23 to current/open; source msha-controller-operator-history