# Relationship history for MSHA mine 4104339

Current hierarchy: **Donald J  Denton → North Texas Crushed Stone Inc → North Texas Crushed Stone Inc**

- 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

- **operator_operates_mine:** Lone Star Crushed Stone and Sand Incorporated → North Texas Crushed Stone Inc; 2002-01-02 to 2008-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Baird → North Texas Crushed Stone Inc; 2002-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Baird → Lone Star Crushed Stone and Sand Incorporated; 2002-01-02 to 2008-06-08; source msha-controller-operator-history
- **operator_operates_mine:** North Texas Crushed Stone Inc → North Texas Crushed Stone Inc; 2008-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald J  Denton et al → North Texas Crushed Stone Inc; 2008-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald J  Denton et al → North Texas Crushed Stone Inc; 2008-06-09 to current/open; source msha-controller-operator-history