# Relationship history for MSHA mine 4103277

Current hierarchy: **Cemex S A → Cemex Usa → AUSTIN AGGREGATES**

- 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:** Pioneer International Ltd → AUSTIN AGGREGATES; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Concrete Of Texas Inc → AUSTIN AGGREGATES; 1984-12-01 to 1992-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer Concrete Of Texas Inc; 1984-12-01 to 1992-05-08; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → AUSTIN AGGREGATES; 1990-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Usa → AUSTIN AGGREGATES; 1992-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Usa; 1992-05-09 to current/open; source msha-controller-operator-history