# Relationship history for MSHA mine 3000073

Current hierarchy: **Amrize Ltd → Holcim (US) Inc → Holcim (US) Inc**

- 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:** Marquette Company → Holcim (US) Inc; 1950-01-01 to 1982-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Gulf + Western Industries Inc → Holcim (US) Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc → Marquette Company; 1950-01-01 to 1982-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → Holcim (US) Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lone Star Industries Inc → Holcim (US) Inc; 1982-04-15 to 1984-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1982-04-15 to 1984-06-14; source msha-controller-operator-history
- **operator_operates_mine:** St Lawrence Cement LLC → Holcim (US) Inc; 1984-06-15 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_mine:** St Lawrence Cement LLC → Holcim (US) Inc; 1984-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** St Lawrence Cement LLC → St Lawrence Cement LLC; 1984-06-15 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Holcim (US) Inc; 2001-12-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Holcim (US) Inc → Holcim (US) Inc; 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim (US) Inc; 2008-01-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Holcim (US) Inc; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim (US) Inc; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Holcim (US) Inc; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Holcim (US) Inc; 2025-06-23 to current/open; source msha-controller-operator-history