# Relationship history for MSHA mine 2302493

Current hierarchy: **Michael D  Harman Jr; Matthew R  Clark → Midwest Proppant LLC → Yeida Mine**

- 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:** Matthew R  Clark et al → Yeida Mine; 2015-01-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Proppant LLC → Yeida Mine; 2015-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew R  Clark et al → Midwest Proppant LLC; 2015-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Harman Jr et al → Midwest Proppant LLC; 2015-03-02 to current/open; source msha-controller-operator-history