# Relationship history for MSHA mine 3901091

Current hierarchy: **Gustafson Wayne → Dave Gustafson & Company Inc → Gustafson Pit & Mill No 1 Or Crusher No**

- 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:** Dave Gustafson & Company Inc → Gustafson Pit & Mill No 1 Or Crusher No; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gustafson Wayne → Gustafson Pit & Mill No 1 Or Crusher No; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gustafson Wayne → Dave Gustafson & Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history