# Relationship history for MSHA mine 3401859

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Southwest, LLC → Mill Creek Limestone 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:** Texas Industries Inc → Mill Creek Limestone Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TXI → Mill Creek Limestone Quarry; 2001-03-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI; 2001-03-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Mill Creek Limestone Quarry; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → Mill Creek Limestone Quarry; 2005-03-15 to 2023-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI Operations LP; 2005-03-15 to 2014-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Mill Creek Limestone Quarry; 2007-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Mill Creek Limestone Quarry; 2014-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → TXI Operations LP; 2014-07-02 to 2023-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Southwest, LLC → Mill Creek Limestone Quarry; 2023-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Southwest, LLC; 2023-01-23 to current/open; source msha-controller-operator-history