# Relationship history for MSHA mine 4501237

Current hierarchy: **CRH PLC → ICON Materials → Auburn Facility**

- 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

- **operator_operates_mine:** M A Segale Inc → Auburn Facility; 1950-01-01 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Mark A  Segale et al → Auburn Facility; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark A  Segale et al → M A Segale Inc; 1950-01-01 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Mario A  Segale et al → M A Segale Inc; 1950-01-01 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Auburn Facility; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ICON Materials → Auburn Facility; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → ICON Materials; 1998-05-01 to current/open; source msha-controller-operator-history