# Relationship history for MSHA mine 2200799

Current hierarchy: **Tracy Lynn  Matthews; Rickey G  Matthews → Strayhorn Trucking & Construction, LLC → Sarah**

- 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:** Strayhorn Trucking & Construction, LLC → Sarah; 2010-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rickey G  Matthews et al → Sarah; 2010-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rickey G  Matthews et al → Strayhorn Trucking & Construction, LLC; 2010-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy Lynn  Matthews et al → Strayhorn Trucking & Construction, LLC; 2010-10-21 to current/open; source msha-controller-operator-history