# Relationship history for MSHA mine 4002826

Current hierarchy: **Hutton  Buchanan → Hutton Inc → NEWSOM QUARRY AND MILL**

- 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:** Hutton Inc → NEWSOM QUARRY AND MILL; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hutton  Buchanan et al → NEWSOM QUARRY AND MILL; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hutton  Buchanan et al → Hutton Inc; 1983-02-01 to current/open; source msha-controller-operator-history