# Relationship history for MSHA mine 2103634

Current hierarchy: **Amrize Ltd → Holcim - MWR, Inc. → Titan Power Screen**

- 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

- **controller_controls_mine:** Aggregate Industries PLC → Titan Power Screen; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Holcim - MWR, Inc. → Titan Power Screen; 2008-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Holcim - MWR, Inc.; 2008-06-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Titan Power Screen; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim - MWR, Inc.; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Titan Power Screen; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim - MWR, Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Titan Power Screen; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Holcim - MWR, Inc.; 2025-06-23 to current/open; source msha-controller-operator-history