# Relationship history for MSHA mine 2102961

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Inc. → Kasota Quarry**

- 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:** Martin Marietta Materials Inc → Kasota Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Brielmaier → Kasota Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brielmaier Aggregates Inc → Kasota Quarry; 1987-05-01 to 1999-04-21; source msha-controller-operator-history
- **controller_controls_operator:** William  Brielmaier → Brielmaier Aggregates Inc; 1987-05-01 to 1999-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Larry V  Nurre → Kasota Quarry; 1988-07-01 to 2006-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Southern Minnesota Construction Company, Inc → Kasota Quarry; 1999-04-22 to 2008-12-27; 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 → Kasota Quarry; 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 → Kasota Quarry; 2008-01-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Minnesota Paving & Materials → Kasota Quarry; 2008-12-28 to 2026-01-12; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Minnesota Paving & Materials; 2008-12-28 to 2026-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc. → Kasota Quarry; 2026-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc.; 2026-01-13 to current/open; source msha-controller-operator-history