# Relationship history for MSHA mine 4700907

Current hierarchy: **Amrize Ltd → Amrize Mid-America Inc. → Amrize Colgate Pit Yard 1**

- 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:** Robert G  Tews et al → Amrize Colgate Pit Yard 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tews Company → Amrize Colgate Pit Yard 1; 1978-03-09 to 1998-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Tews et al → Tews Company; 1978-03-09 to 1998-06-30; source msha-controller-operator-history
- **controller_controls_operator:** William L  Tews et al → Tews Company; 1978-03-09 to 1998-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge-Wisconsin Division → Amrize Colgate Pit Yard 1; 1998-07-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Colgate Pit Yard 1; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge-Wisconsin Division; 1998-07-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Colgate Pit Yard 1; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Incorporated → Amrize Colgate Pit Yard 1; 2002-04-01 to 2019-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Incorporated; 2002-04-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Colgate Pit Yard 1; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Colgate Pit Yard 1; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Colgate Pit Yard 1; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Incorporated; 2015-07-10 to 2019-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Mid-America Inc. → Amrize Colgate Pit Yard 1; 2019-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Mid-America Inc.; 2019-12-03 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Amrize Mid-America Inc.; 2019-12-03 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Colgate Pit Yard 1; 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