# Relationship history for MSHA mine 1401640

Current hierarchy: **CRH PLC → Ash Grove Aggregates → Rental Plant**

- 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:** Ash Grove Cement Company → Rental Plant; 1950-01-01 to 2018-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Ash Grove Aggregates → Rental Plant; 2005-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ash Grove Cement Company → Ash Grove Aggregates; 2005-04-11 to 2018-06-20; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Rental Plant; 2018-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Ash Grove Aggregates; 2018-06-21 to current/open; source msha-controller-operator-history