# Relationship history for MSHA mine 4103909

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Southwest, LLC → Garfield Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Cemex S A → Garfield Sand & Gravel; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Garfield Sand & Gravel; 1994-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J C Evans Construction Company → Garfield Sand & Gravel; 1996-05-01 to 1999-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Blake A  Kuhlman → Garfield Sand & Gravel; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blake A  Kuhlman → J C Evans Construction Company; 1996-05-01 to 1999-09-06; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Usa → Garfield Sand & Gravel; 1999-09-07 to 2003-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Usa; 1999-09-07 to 2003-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Inc → Garfield Sand & Gravel; 2003-07-10 to 2011-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Inc; 2003-07-10 to 2011-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Garfield Sand & Gravel; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Garfield Sand & Gravel; 2007-11-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → Garfield Sand & Gravel; 2011-07-30 to 2023-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI Operations LP; 2011-07-30 to 2014-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Garfield Sand & Gravel; 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 → Garfield Sand & Gravel; 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