# Relationship history for MSHA mine 4406819

Current hierarchy: **Amrize Ltd → Amrize Mid-Atlantic Inc. → Amrize Hayfield Mine**

- 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:** Northeast Solite Corp → Amrize Hayfield Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Hayfield Mine; 1950-01-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Solite Corp → Amrize Hayfield Mine; 1995-11-01 to 1997-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Northeast Solite Corp → Solite Corp; 1995-11-01 to 1997-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Atlantic Materials Incorporated → Amrize Hayfield Mine; 1997-08-29 to 2011-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Mid-Atlantic Materials Incorporated; 1997-08-29 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Hayfield Mine; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Hayfield Mine; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Mid-Atlantic Materials Incorporated; 2009-04-30 to 2011-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Mid-Atlantic Inc. → Amrize Hayfield Mine; 2011-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Mid-Atlantic Inc.; 2011-07-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Mid-Atlantic Inc.; 2011-07-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Hayfield Mine; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Mid-Atlantic Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Hayfield Mine; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Mid-Atlantic Inc.; 2025-06-23 to current/open; source msha-controller-operator-history