# Relationship history for MSHA mine 0301899

Current hierarchy: **CRH PLC → Arkhola → Portable 1313 - Plant # 116**

- 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:** Ashland Inc → Portable 1313 - Plant # 116; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Arkhola → Portable 1313 - Plant # 116; 2004-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Arkhola; 2004-10-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Portable 1313 - Plant # 116; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Arkhola; 2006-08-28 to current/open; source msha-controller-operator-history