# Relationship history for MSHA mine 1103144

Current hierarchy: **Amrize Ltd → Amrize Mid-America Inc. → Amrize The R S & D Mine**

- 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:** Rein-Schultz & Dahl Of Illinois Inc → Amrize The R S & D Mine; 1950-01-01 to 2006-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Fox River Inc → Amrize The R S & D Mine; 2005-06-01 to 2009-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Rein-Schultz & Dahl Of Illinois Inc → Lafarge Fox River Inc; 2005-06-01 to 2006-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize The R S & D Mine; 2006-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Fox River Inc; 2006-04-09 to 2009-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize The R S & D Mine; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Mid-America Inc. → Amrize The R S & D Mine; 2009-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Amrize Mid-America Inc.; 2009-06-02 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize The R S & D Mine; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Mid-America Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize The R S & D Mine; 2025-06-23 to current/open; 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