# Relationship history for MSHA mine 2302151

Current hierarchy: **Phil  Hutchens → Hutchens Construction Company → WASHBURN QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Phil  Hutchens → WASHBURN QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hutchens Construction Company → WASHBURN QUARRY; 1996-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phil  Hutchens → Hutchens Construction Company; 1996-11-01 to current/open; source msha-controller-operator-history