# Relationship history for MSHA mine 1601070

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Southwest, LLC → Woodworth Aggregates**

- 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 → Woodworth Aggregates; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M D  Bryant Jr et al → Woodworth Aggregates; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid State Sand & Gravel Company Inc → Woodworth Aggregates; 1985-11-01 to 2000-06-04; source msha-controller-operator-history
- **controller_controls_operator:** M D  Bryant Jr et al → Mid State Sand & Gravel Company Inc; 1985-11-01 to 2000-06-04; source msha-controller-operator-history
- **operator_operates_mine:** TXI (A/K/A Texas Industries Inc) → Woodworth Aggregates; 2000-06-05 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI (A/K/A Texas Industries Inc); 2000-06-05 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Woodworth Aggregates; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → Woodworth Aggregates; 2005-03-15 to 2023-04-19; 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 → Woodworth Aggregates; 2007-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Woodworth Aggregates; 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 2023-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Southwest, LLC → Woodworth Aggregates; 2023-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Southwest, LLC; 2023-04-20 to current/open; source msha-controller-operator-history