# Relationship history for MSHA mine 2100789

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Inc. → New Ulm 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → New Ulm Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Ulm Quartzite Quarries Inc → New Ulm Quarry; 1950-01-01 to 2011-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey G  Carlstrom → New Ulm Quarry; 1950-01-01 to 2011-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey G  Carlstrom → New Ulm Quartzite Quarries Inc; 1950-01-01 to 2011-08-16; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → New Ulm Quarry; 2008-01-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Minnesota Paving & Materials → New Ulm Quarry; 2011-08-17 to 2026-01-12; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Minnesota Paving & Materials; 2011-08-17 to 2026-01-12; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → New Ulm Quarry; 2011-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → New Ulm Quartzite Quarries Inc; 2011-08-17 to 2011-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc. → New Ulm 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