# Relationship history for MSHA mine 4407056

Current hierarchy: **Amrize Ltd → Holcim - MAR, Inc. → Holcim - MAR, Inc. Charles City 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Aggregate Industries PLC → Holcim - MAR, Inc. Charles City Plant; 1950-01-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Robert Brett House → Holcim - MAR, Inc. Charles City Plant; 2002-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brett Aggregates Inc → Holcim - MAR, Inc. Charles City Plant; 2002-08-19 to 2008-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Robert Brett House → Brett Aggregates Inc; 2002-08-19 to 2008-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Atlantic Materials Inc → Holcim - MAR, Inc. Charles City Plant; 2008-06-24 to 2011-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Mid-Atlantic Materials Inc; 2008-06-24 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Holcim - MAR, Inc. Charles City Plant; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Holcim - MAR, Inc. Charles City Plant; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Mid-Atlantic Materials Inc; 2009-04-30 to 2011-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Holcim - MAR, Inc. → Holcim - MAR, Inc. Charles City Plant; 2011-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim - MAR, Inc.; 2011-07-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Holcim - MAR, Inc.; 2011-07-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Holcim - MAR, Inc. Charles City Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim - MAR, Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Holcim - MAR, Inc. Charles City Plant; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Holcim - MAR, Inc.; 2025-06-23 to current/open; source msha-controller-operator-history