# Relationship history for MSHA mine 4201475

Current hierarchy: **Atomic Western → Atomic Western → Silver Belle**

- 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:** Shumway & Shumway Mining Company → Silver Belle; 1978-03-09 to 1978-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Shumway & Shumway Mining Company → Silver Belle; 1978-03-09 to 1978-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Shumway & Shumway Mining Company → Shumway & Shumway Mining Company; 1978-03-09 to 1978-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Atomic Western → Silver Belle; 1978-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Atomic Western → Silver Belle; 1978-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atomic Western → Atomic Western; 1978-09-12 to current/open; source msha-controller-operator-history