# Relationship history for MSHA mine 0203431

Current hierarchy: **Amrize Ltd → Amrize West Central Inc. → Amrize Smoke Stack**

- 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:** Gary  Schnurr → Amrize Smoke Stack; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Garth  Frehner → Amrize Smoke Stack; 1983-08-01 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Smoke Stack; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Smoke Stack; 2004-05-10 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Smoke Stack; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** JLL Partners Incorporated → Amrize Smoke Stack; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Smoke Stack; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Landscaping Materials → Amrize Smoke Stack; 2020-04-07 to 2023-02-19; source msha-controller-operator-history
- **controller_controls_operator:** JLL Partners Incorporated → Pioneer Landscaping Materials; 2020-04-07 to 2023-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Schnurr → Pioneer Landscaping Materials; 2020-04-07 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Southwest Inc. → Amrize Smoke Stack; 2023-02-20 to 2026-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Southwest Inc.; 2023-02-20 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Southwest Inc.; 2023-02-20 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Garth  Frehner → Amrize Southwest Inc.; 2023-02-20 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Southwest Inc.; 2023-02-20 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Smoke Stack; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Southwest Inc.; 2025-06-23 to 2026-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Amrize West Central Inc. → Amrize Smoke Stack; 2026-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2026-08-05 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize West Central Inc.; 2026-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2026-08-05 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize West Central Inc.; 2026-08-05 to 2009-04-29; source msha-controller-operator-history