# Relationship history for MSHA mine 0203118

Current hierarchy: **Amrize Ltd → Amrize Southwest Inc. → Amrize Sand Crusher #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Gary  Schnurr → Amrize Sand Crusher #2; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Garth  Frehner → Amrize Sand Crusher #2; 1983-08-01 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Sand Crusher #2; 2004-05-10 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Landscaping Materials, Inc → Amrize Sand Crusher #2; 2006-02-17 to 2023-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Schnurr → Pioneer Landscaping Materials, Inc; 2006-02-17 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Sand Crusher #2; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** JLL Partners Incorporated → Amrize Sand Crusher #2; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** JLL Partners Incorporated → Pioneer Landscaping Materials, Inc; 2015-01-01 to 2023-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Sand Crusher #2; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Southwest Inc. → Amrize Sand Crusher #2; 2023-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Southwest Inc.; 2023-04-05 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Southwest Inc.; 2023-04-05 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Garth  Frehner → Amrize Southwest Inc.; 2023-04-05 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Southwest Inc.; 2023-04-05 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Sand Crusher #2; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Southwest Inc.; 2025-06-23 to current/open; source msha-controller-operator-history