# Relationship history for MSHA mine 3401483

Current hierarchy: **Martin Marietta Materials Inc → TXI Operations LP → TXI Red River**

- 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 → TXI Red River; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Sand & Gravel Inc → TXI Red River; 1985-04-01 to 1992-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert A  Hodges → TXI Red River; 1985-04-01 to 1992-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Hodges → Southwest Sand & Gravel Inc; 1985-04-01 to 1992-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Texas Industries → TXI Red River; 1992-09-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → Texas Industries; 1992-09-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → TXI Red River; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → TXI Red River; 2005-03-15 to current/open; 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 → TXI Red River; 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 current/open; source msha-controller-operator-history