# Relationship history for MSHA mine 1700884

Current hierarchy: **Brad  Stout; Dylan  Coutts; Scott  Coutts → QUIRION → QUIRION Astec Track Screen**

- 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:** Quirion Construction Inc → QUIRION Astec Track Screen; 2011-09-28 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** William P  Quirion → QUIRION Astec Track Screen; 2011-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William P  Quirion → Quirion Construction Inc; 2011-09-28 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** QUIRION → QUIRION Astec Track Screen; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dylan  Coutts et al → QUIRION Astec Track Screen; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dylan  Coutts et al → QUIRION; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Stout et al → QUIRION; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Coutts et al → QUIRION; 2021-01-01 to current/open; source msha-controller-operator-history