# Relationship history for MSHA mine 2200750

Current hierarchy: **CRH PLC → Blain Sand & Gravel, Inc. → Ford 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Blain Sand & Gravel Inc → Ford Pit; 1950-01-01 to 2021-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Blain Sand & Gravel, Inc. → Ford Pit; 2003-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blain Sand & Gravel Inc → Blain Sand & Gravel, Inc.; 2003-08-11 to 2021-12-02; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ford Pit; 2021-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Blain Sand & Gravel, Inc.; 2021-12-03 to current/open; source msha-controller-operator-history