# Relationship history for MSHA mine 4201976

Current hierarchy: **Jones Royce R → Bell Boy Placer → Bell Boy**

- 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:** Orofino Mining Company → Bell Boy; 1986-04-01 to 1987-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Orofino Mining Company → Bell Boy; 1986-04-01 to 1987-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Orofino Mining Company → Orofino Mining Company; 1986-04-01 to 1987-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Bell Boy Placer → Bell Boy; 1987-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Royce R → Bell Boy; 1987-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Royce R → Bell Boy Placer; 1987-06-16 to current/open; source msha-controller-operator-history