# Relationship history for MSHA mine 4101146

Current hierarchy: **Martin Marietta Materials Inc → TXI Operations LP → Tec Minerals Plant #3**

- 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 Industries Inc → Tec Minerals Plant #3; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → Tec Minerals Plant #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1950-01-01 to 1985-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Tec Minerals Plant #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → Tec Minerals Plant #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Concrete Of Texas Inc → Tec Minerals Plant #3; 1985-04-01 to 1995-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer Concrete Of Texas Inc; 1985-04-01 to 1995-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Dolen Sand & Gravel Llc → Tec Minerals Plant #3; 1995-05-15 to 1995-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert B  Baker et al → Tec Minerals Plant #3; 1995-05-15 to 1995-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  Baker et al → Dolen Sand & Gravel Llc; 1995-05-15 to 1995-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Texas Industries → Tec Minerals Plant #3; 1995-10-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → Texas Industries; 1995-10-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Tec Minerals Plant #3; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → Tec Minerals Plant #3; 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 → Tec Minerals Plant #3; 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