# Relationship history for MSHA mine 4104394

Current hierarchy: **Arcosa, Inc → Trinity Materials, Inc. → Hearne Plant # 1551**

- 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

- **controller_controls_mine:** Trinity Industries Inc → Hearne Plant # 1551; 1991-12-01 to 2018-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Windham Construction Materials LTD → Hearne Plant # 1551; 2003-01-13 to 2009-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Brian N  Windham → Hearne Plant # 1551; 2003-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian N  Windham → Windham Construction Materials LTD; 2003-01-13 to 2009-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Materials, Inc. → Hearne Plant # 1551; 2009-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trinity Industries Inc → Trinity Materials, Inc.; 2009-03-23 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → Hearne Plant # 1551; 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → Trinity Materials, Inc.; 2018-11-01 to current/open; source msha-controller-operator-history