# Relationship history for MSHA mine 1100786

Current hierarchy: **Amrize Ltd → Amrize Cement Inc. → Amrize Joppa 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:** Missouri Portland Cement Company → Amrize Joppa Plant; 1950-01-01 to 1985-12-26; source msha-controller-operator-history
- **controller_controls_mine:** H K Porter Company Inc → Amrize Joppa Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H K Porter Company Inc → Missouri Portland Cement Company; 1950-01-01 to 1985-12-26; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Joppa Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Joppa Plant; 1981-11-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corporation → Amrize Joppa Plant; 1985-12-27 to 2007-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corporation; 1985-12-27 to 2007-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Joppa Plant; 2001-12-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Midwest → Amrize Joppa Plant; 2007-09-01 to 2018-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Midwest; 2007-09-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Joppa Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Joppa Plant; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge Midwest; 2015-07-10 to 2018-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Cement Inc. → Amrize Joppa Plant; 2018-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Cement Inc.; 2018-01-31 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Cement Inc.; 2018-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Joppa 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