# Relationship history for MSHA mine 1401684

Current hierarchy: **CRH PLC → APAC- Kansas Inc Shears Division → Dodge City Portable**

- 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 → Dodge City Portable; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Dodge City Portable; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APAC- Kansas Inc Shears Division → Dodge City Portable; 2008-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → APAC- Kansas Inc Shears Division; 2008-04-14 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → APAC- Kansas Inc Shears Division; 2008-04-14 to current/open; source msha-controller-operator-history