# Relationship history for MSHA mine 2103628

Current hierarchy: **CRH PLC → Minnesota Paving & Materials → 001964**

- 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:** Steve  Hall → 001964; 1950-01-01 to 2017-02-23; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → 001964; 2008-01-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hardrives Inc → 001964; 2008-06-19 to 2019-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Hall → Hardrives Inc; 2008-06-19 to 2017-02-23; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → 001964; 2017-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hardrives Inc; 2017-02-24 to 2019-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Minnesota Paving & Materials → 001964; 2019-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Minnesota Paving & Materials; 2019-04-01 to current/open; source msha-controller-operator-history