# Relationship history for MSHA mine 1401484

Current hierarchy: **CRH PLC → Holliday Sand & Gravel → Bonner Springs-Plant #7**

- 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:** Peter E  Powell → Bonner Springs-Plant #7; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** List & Clark Construction Company → Bonner Springs-Plant #7; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Builders Sand Company → Bonner Springs-Plant #7; 1985-08-01 to 1999-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Peter E  Powell → Builders Sand Company; 1985-08-01 to 1999-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Sand & Gravel → Bonner Springs-Plant #7; 1999-01-21 to 2008-07-31; source msha-controller-operator-history
- **controller_controls_operator:** List & Clark Construction Company → Holliday Sand & Gravel; 1999-01-21 to 2008-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Sand & Gravel → Bonner Springs-Plant #7; 2008-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ash Grove Cement Company → Bonner Springs-Plant #7; 2008-08-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Holliday Sand & Gravel; 2008-08-01 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Bonner Springs-Plant #7; 2018-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Holliday Sand & Gravel; 2018-06-21 to current/open; source msha-controller-operator-history