# Relationship history for MSHA mine 4200071

Current hierarchy: **Amrize Ltd → Amrize Southwest Inc. → Amrize Utelite Site**

- 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:** Utelite Corp → Amrize Utelite Site; 1950-01-01 to 2021-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Carsten N  Mortensen → Amrize Utelite Site; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carsten N  Mortensen → Utelite Corp; 1950-01-01 to 2021-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Garth  Frehner → Amrize Utelite Site; 1983-08-01 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Utelite Site; 2004-05-10 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Utelite Site; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Utelite Site; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Southwest Inc. → Amrize Utelite Site; 2021-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Southwest Inc.; 2021-09-25 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Southwest Inc.; 2021-09-25 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Garth  Frehner → Amrize Southwest Inc.; 2021-09-25 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Southwest Inc.; 2021-09-25 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Utelite Site; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Southwest Inc.; 2025-06-23 to current/open; source msha-controller-operator-history