# Relationship history for MSHA mine 0504476

Current hierarchy: **Amrize Ltd → Amrize West Central Inc. → Amrize Distel Plant**

- 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:** David B  Nystrom → Amrize Distel Plant; 1991-01-01 to 1994-10-27; source msha-controller-operator-history
- **operator_operates_mine:** C & M Ready Mix Concrete Company Of Boulder → Amrize Distel Plant; 1991-02-01 to 1994-10-27; source msha-controller-operator-history
- **controller_controls_operator:** David B  Nystrom → C & M Ready Mix Concrete Company Of Boulder; 1991-02-01 to 1994-10-27; source msha-controller-operator-history
- **operator_operates_mine:** C & M Aggregates Ltd → Amrize Distel Plant; 1994-10-28 to 1997-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Camas Plc → Amrize Distel Plant; 1994-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Camas Plc → C & M Aggregates Ltd; 1994-10-28 to 1997-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Amrize West Central Inc. → Amrize Distel Plant; 1997-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Distel Plant; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize West Central Inc.; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Distel Plant; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Distel Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Distel Plant; 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