# Relationship history for MSHA mine 1100486

Current hierarchy: **Duchossios Enterprises-Thrall Enterprises → Western Stoneware Company → Valentine Welch & Booz**

- 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:** Western Stoneware Company → Valentine Welch & Booz; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duchossios Enterprises-Thrall Enterprises → Valentine Welch & Booz; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duchossios Enterprises-Thrall Enterprises → Western Stoneware Company; 1950-01-01 to current/open; source msha-controller-operator-history