# Relationship history for MSHA mine 4103355

Current hierarchy: **Arcosa, Inc → Trinity Materials Inc → WHISKEY BRANCH**

- 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:** B Curtis  Smith → WHISKEY BRANCH; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cle-Tex Materials Inc → WHISKEY BRANCH; 1985-12-01 to 1993-03-30; source msha-controller-operator-history
- **controller_controls_operator:** B Curtis  Smith → Cle-Tex Materials Inc; 1985-12-01 to 1993-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Trinity Industries Inc → WHISKEY BRANCH; 1991-12-01 to 2018-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Materials Inc → WHISKEY BRANCH; 1993-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trinity Industries Inc → Trinity Materials Inc; 1993-03-31 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → WHISKEY BRANCH; 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