# Relationship history for MSHA mine 2103503

Current hierarchy: **CRH PLC → Southern Minnesota Construction → 01971 C**

- 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:** Larry V  Nurre → 01971 C; 1988-07-01 to 2006-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Southern Minnesota Construction Company, Inc. → 01971 C; 2005-06-14 to 2008-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Larry V  Nurre → Southern Minnesota Construction Company, Inc.; 2005-06-14 to 2006-03-01; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → 01971 C; 2006-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Southern Minnesota Construction Company, Inc.; 2006-03-02 to 2008-12-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → 01971 C; 2008-01-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Minnesota Construction → 01971 C; 2008-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Southern Minnesota Construction; 2008-12-28 to current/open; source msha-controller-operator-history