# Relationship history for MSHA mine 3503943

Current hierarchy: **Griff A  Yates; Spencer C  Yates → Yates Road Building → Plant #3**

- 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:** Charlie L  Yates → Plant #3; 2010-02-25 to 2019-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Spencer C  Yates et al → Plant #3; 2019-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yates Road Building → Plant #3; 2023-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charlie L  Yates → Yates Road Building; 2023-04-04 to 2019-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Spencer C  Yates et al → Yates Road Building; 2023-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Griff A  Yates et al → Yates Road Building; 2023-04-04 to current/open; source msha-controller-operator-history