# Relationship history for MSHA mine 3200657

Current hierarchy: **Haugen Gary → Minot Sand & Gravel Inc → Minot Pit & Plant Portable**

- 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:** Minot Sand & Gravel Inc → Minot Pit & Plant Portable; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Haugen Gary → Minot Pit & Plant Portable; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haugen Gary → Minot Sand & Gravel Inc; 1982-08-01 to current/open; source msha-controller-operator-history