# Relationship history for MSHA mine 1101108

Current hierarchy: **Amrize Ltd → Amrize Mid-America Inc. → Amrize Marengo Pit #39**

- 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:** Meyer Material Acquisition Corp Et Al → Amrize Marengo Pit #39; 1950-01-01 to 2011-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Floyd M  Griebel Jr → Amrize Marengo Pit #39; 1950-01-01 to 1996-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Griebel Trucking Company → Amrize Marengo Pit #39; 1990-10-01 to 1996-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Floyd M  Griebel Jr → Griebel Trucking Company; 1990-10-01 to 1996-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Meyer Material Company → Amrize Marengo Pit #39; 1996-10-22 to 2022-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Meyer Material Acquisition Corp Et Al → Meyer Material Company; 1996-10-22 to 2011-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Marengo Pit #39; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Marengo Pit #39; 2011-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Meyer Material Company; 2011-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Marengo Pit #39; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Meyer Material Company; 2015-07-10 to 2022-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Mid-America Inc. → Amrize Marengo Pit #39; 2022-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Mid-America Inc.; 2022-05-01 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Amrize Mid-America Inc.; 2022-05-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Marengo Pit #39; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Meyer Material Company; 2025-06-23 to 2022-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Mid-America Inc.; 2025-06-23 to current/open; source msha-controller-operator-history