# Relationship history for MSHA mine 3700220

Current hierarchy: **Dustin J  Everson; John E  Everson → Narragansett Improvement Co. → Arcadia Gravel Pit**

- 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

- **operator_operates_mine:** Narragansett Improvement Co. → Arcadia Gravel Pit; 2013-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dustin J  Everson et al → Arcadia Gravel Pit; 2013-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dustin J  Everson et al → Narragansett Improvement Co.; 2013-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John E  Everson et al → Narragansett Improvement Co.; 2013-10-22 to current/open; source msha-controller-operator-history