# Relationship history for MSHA mine 4103307

Current hierarchy: **Amrize Ltd → Amrize Cement Inc. → Amrize Midlothian Plant**

- 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

- **operator_operates_mine:** Box-Crow Cement Company Lp → Amrize Midlothian Plant; 1985-04-01 to 1993-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Box Cement Company et al → Amrize Midlothian Plant; 1985-04-01 to 1993-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Box Cement Company et al → Box-Crow Cement Company Lp; 1985-04-01 to 1993-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Holcim (Texas) LP → Amrize Midlothian Plant; 1993-05-19 to 2018-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd et al → Amrize Midlothian Plant; 1993-05-19 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd et al → Holcim (Texas) LP; 1993-05-19 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Crow Holdings  et al → Holcim (Texas) LP; 1993-05-19 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Midlothian Plant; 2001-12-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Midlothian Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Midlothian Plant; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim (Texas) LP; 2015-07-10 to 2018-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Cement Inc. → Amrize Midlothian Plant; 2018-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Cement Inc.; 2018-04-30 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Cement Inc.; 2018-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Midlothian Plant; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Cement Inc.; 2025-06-23 to current/open; source msha-controller-operator-history