# Relationship history for MSHA mine 2700284

Current hierarchy: **Amrize Ltd → Amrize Northeast Inc. → Amrize Raymond 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** R David  Schelzi → Amrize Raymond Quarry; 1979-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wakefield Materials Corp → Amrize Raymond Quarry; 1989-03-01 to 2002-09-05; source msha-controller-operator-history
- **controller_controls_operator:** R David  Schelzi → Wakefield Materials Corp; 1989-03-01 to 2002-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Raymond Quarry; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Northeast Inc. → Amrize Raymond Quarry; 2002-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Northeast Inc.; 2002-09-06 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Raymond 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 Raymond 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 Raymond 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