# Relationship history for MSHA mine 1401326

Current hierarchy: **CRH PLC → Hilty Quarries Inc → Cedarapids 1 Portable 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:** Ashland Inc → Cedarapids 1 Portable Plant; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** John  Hilty  et al → Cedarapids 1 Portable Plant; 1950-01-01 to 2009-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Apac-Kansas Inc → Cedarapids 1 Portable Plant; 1979-01-01 to 2011-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac-Kansas Inc; 1979-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Cedarapids 1 Portable Plant; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Apac-Kansas Inc; 2006-08-28 to 2011-08-03; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Cedarapids 1 Portable Plant; 2009-11-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hilty Quarries Inc → Cedarapids 1 Portable Plant; 2011-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Hilty  et al → Hilty Quarries Inc; 2011-08-04 to 2009-11-03; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hilty Quarries Inc; 2011-08-04 to current/open; source msha-controller-operator-history