# Relationship history for MSHA mine 0501902

Current hierarchy: **Amrize Ltd → Amrize West Central Inc. → Amrize Daniels Sand Pit # 1 & 2**

- 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:** Daniels Sand/Transit Mix Concrete → Amrize Daniels Sand Pit # 1 & 2; 1950-01-01 to 2019-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Continental Materials Corp → Amrize Daniels Sand Pit # 1 & 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Continental Materials Corp → Daniels Sand/Transit Mix Concrete; 1950-01-01 to 2019-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Daniels Sand Pit # 1 & 2; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Daniels Sand Pit # 1 & 2; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Daniels Sand Pit # 1 & 2; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Amrize West Central Inc. → Amrize Daniels Sand Pit # 1 & 2; 2019-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2019-02-01 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2019-02-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize West Central Inc.; 2019-02-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Daniels Sand Pit # 1 & 2; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize West Central Inc.; 2025-06-23 to current/open; source msha-controller-operator-history