# Relationship history for MSHA mine 2902526

Current hierarchy: **Jason  Turner; Julie  Turner → Turner Brothers Construction → Vaughn Quarry**

- 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:** Turner Brothers Construction → Vaughn Quarry; 2020-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason  Turner et al → Vaughn Quarry; 2020-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Turner et al → Turner Brothers Construction; 2020-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Julie  Turner et al → Turner Brothers Construction; 2020-12-07 to current/open; source msha-controller-operator-history