# Relationship history for MSHA mine 4102996

Current hierarchy: **Arcosa, Inc → Trinity Materials Inc → Malakoff S & G**

- 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:** Lafarge S A → Malakoff S & G; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** East Texas Materials → Malakoff S & G; 1980-03-01 to 1988-06-15; source msha-controller-operator-history
- **controller_controls_mine:** R E Hable Company → Malakoff S & G; 1980-03-01 to 1988-06-15; source msha-controller-operator-history
- **controller_controls_operator:** R E Hable Company → East Texas Materials; 1980-03-01 to 1988-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → Malakoff S & G; 1988-06-16 to 1994-12-15; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1988-06-16 to 1994-12-15; source msha-controller-operator-history
- **controller_controls_mine:** Trinity Industries Inc → Malakoff S & G; 1991-12-01 to 2018-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Materials Inc → Malakoff S & G; 1994-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trinity Industries Inc → Trinity Materials Inc; 1994-12-16 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → Malakoff S & G; 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → Trinity Materials Inc; 2018-11-01 to current/open; source msha-controller-operator-history