# Relationship history for MSHA mine 0202531

Current hierarchy: **Archie J  Smith; Wesley S  Smith → Texas Canyon Rock & Sand → TEXAS CANYON ROCK & SAND**

- 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:** Texas Canyon Rock & Sand → TEXAS CANYON ROCK & SAND; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wesley S  Smith et al → TEXAS CANYON ROCK & SAND; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wesley S  Smith et al → Texas Canyon Rock & Sand; 1990-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Archie J  Smith et al → Texas Canyon Rock & Sand; 1990-07-01 to current/open; source msha-controller-operator-history