# Relationship history for MSHA mine 2101324

Current hierarchy: **Amrize Ltd → AMRIZE MID-AMERICA INC. → Amrize Park Region Pit-Mill**

- 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:** Park Region Aggregate Inc → Amrize Park Region Pit-Mill; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Eberhardt Roger → Amrize Park Region Pit-Mill; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Eberhardt Roger → Park Region Aggregate Inc; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Camas Plc → Amrize Park Region Pit-Mill; 1994-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minndak Inc → Amrize Park Region Pit-Mill; 1997-01-01 to 1997-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Camas Plc → Camas Minndak Inc; 1997-01-01 to 1997-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minndak Inc → Amrize Park Region Pit-Mill; 1997-05-14 to 2002-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Park Region Pit-Mill; 1997-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Camas Minndak Inc; 1997-05-14 to 2002-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Park Region Pit-Mill; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries, Inc. → Amrize Park Region Pit-Mill; 2002-03-07 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries, Inc.; 2002-03-07 to 2003-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Midwest Inc. → Amrize Park Region Pit-Mill; 2003-11-26 to 2026-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Park Region Pit-Mill; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Midwest Inc.; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Park Region Pit-Mill; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries, Inc.; 2009-04-30 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Midwest Inc.; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Park Region Pit-Mill; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Park Region Pit-Mill; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries, Inc.; 2015-07-10 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Midwest Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Park Region Pit-Mill; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries, Inc.; 2025-06-23 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Midwest Inc.; 2025-06-23 to 2026-04-14; source msha-controller-operator-history
- **operator_operates_mine:** AMRIZE MID-AMERICA INC. → Amrize Park Region Pit-Mill; 2026-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → AMRIZE MID-AMERICA INC.; 2026-04-15 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → AMRIZE MID-AMERICA INC.; 2026-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → AMRIZE MID-AMERICA INC.; 2026-04-15 to 2015-07-09; source msha-controller-operator-history