# Relationship history for MSHA mine 1601463

Current hierarchy: **CRH PLC → Barriere Construction Co LLC → Frazier Gravel Pit**

- 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:** Peter A  Wilson  et al → Frazier Gravel Pit; 1988-09-01 to 2023-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Barriere Construction Co LLC → Frazier Gravel Pit; 2007-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter A  Wilson  et al → Barriere Construction Co LLC; 2007-06-18 to 2023-01-09; source msha-controller-operator-history
- **controller_controls_operator:** George H  Wilson  et al → Barriere Construction Co LLC; 2007-06-18 to 2023-01-09; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Frazier Gravel Pit; 2023-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Barriere Construction Co LLC; 2023-01-10 to current/open; source msha-controller-operator-history