# Relationship history for MSHA mine 1101167

Current hierarchy: **Amrize Ltd → Amrize Mid-America Inc. → Amrize McHenry Pit #26**

- 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 McHenry Pit #26; 1950-01-01 to 2011-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Mc Henry Sand & Gravel Company Inc → Amrize McHenry Pit #26; 1950-01-01 to 1988-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Charles J  Miller → Amrize McHenry Pit #26; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles J  Miller → Mc Henry Sand & Gravel Company Inc; 1950-01-01 to 1988-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Meyer Material Company → Amrize McHenry Pit #26; 1988-09-09 to 2022-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Meyer Material Acquisition Corp Et Al → Meyer Material Company; 1988-09-09 to 2011-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize McHenry Pit #26; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize McHenry Pit #26; 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 McHenry Pit #26; 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 McHenry Pit #26; 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 McHenry Pit #26; 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