# Relationship history for MSHA mine 1900359

Current hierarchy: **Amrize Ltd → Amrize Northeast Inc. → Amrize Littleton Quarry**

- 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:** Lone Star Industries Inc → Amrize Littleton Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** San-Vel Concrete Corp → Amrize Littleton Quarry; 1950-01-01 to 1979-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Millard O  Pierce → Amrize Littleton Quarry; 1950-01-01 to 1979-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Millard O  Pierce → San-Vel Concrete Corp; 1950-01-01 to 1979-06-25; source msha-controller-operator-history
- **operator_operates_mine:** New York Trap Rock Corp → Amrize Littleton Quarry; 1979-06-26 to 1992-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → New York Trap Rock Corp; 1979-06-26 to 1992-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Middlesex Materials Corp → Amrize Littleton Quarry; 1992-08-11 to 1999-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Pereira → Amrize Littleton Quarry; 1992-08-11 to 1999-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Pereira → Middlesex Materials Corp; 1992-08-11 to 1999-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Bardon Trimount Inc → Amrize Littleton Quarry; 1999-06-11 to 2002-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Littleton Quarry; 1999-06-11 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Bardon Trimount Inc; 1999-06-11 to 2002-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Littleton Quarry; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Northeast Inc. → Amrize Littleton Quarry; 2002-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Northeast Inc.; 2002-08-22 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Littleton Quarry; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Northeast Inc.; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Littleton Quarry; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Bardon Trimount Inc; 2009-04-30 to 2002-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Littleton Quarry; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Northeast Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Littleton Quarry; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Northeast Inc.; 2025-06-23 to current/open; source msha-controller-operator-history