# Relationship history for MSHA mine 3609400

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → St. Thomas 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

- **controller_controls_mine:** Hanson PLC → St. Thomas Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** St. Thomas Development, LLC. → St. Thomas Quarry; 2006-05-02 to 2025-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Peter DePaul Irrevocable Combined Trust → St. Thomas Quarry; 2006-05-02 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Peter DePaul Irrevocable Combined Trust → St. Thomas Development, LLC.; 2006-05-02 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → St. Thomas Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → St. Thomas Quarry; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → St. Thomas Development, LLC.; 2024-08-01 to 2025-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → St. Thomas Quarry; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 2025-05-01 to 2007-08-22; source msha-controller-operator-history