# Relationship history for MSHA mine 0505141

Current hierarchy: **Amrize Ltd → Amrize West Central Inc. → Amrize RP2 (Rock Pit #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

- **controller_controls_mine:** Gary  Schnurr → Amrize RP2 (Rock Pit #2); 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize RP2 (Rock Pit #2); 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize RP2 (Rock Pit #2); 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** JLL Partners Incorporated → Amrize RP2 (Rock Pit #2); 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize RP2 (Rock Pit #2); 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Landscaping Materials Inc → Amrize RP2 (Rock Pit #2); 2022-01-11 to 2023-01-15; source msha-controller-operator-history
- **controller_controls_operator:** JLL Partners Incorporated → Pioneer Landscaping Materials Inc; 2022-01-11 to 2023-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Schnurr → Pioneer Landscaping Materials Inc; 2022-01-11 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Amrize West Central Inc. → Amrize RP2 (Rock Pit #2); 2023-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2023-01-16 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2023-01-16 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize West Central Inc.; 2023-01-16 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize RP2 (Rock Pit #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