# Relationship history for MSHA mine 2100056

Current hierarchy: **CRH PLC → Southern Minnesota Construction Company, Inc. → #4093 Eljay Crusher Jefferson**

- 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

- **operator_operates_mine:** Brielmaier Aggregates Inc → #4093 Eljay Crusher Jefferson; 1950-01-01 to 1999-04-21; source msha-controller-operator-history
- **controller_controls_mine:** William  Brielmaier → #4093 Eljay Crusher Jefferson; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Brielmaier → Brielmaier Aggregates Inc; 1950-01-01 to 1999-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Larry V  Nurre → #4093 Eljay Crusher Jefferson; 1988-07-01 to 2006-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Southern Minnesota Construction Company, Inc. → #4093 Eljay Crusher Jefferson; 1999-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry V  Nurre → Southern Minnesota Construction Company, Inc.; 1999-04-22 to 2006-03-01; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → #4093 Eljay Crusher Jefferson; 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 current/open; source msha-controller-operator-history