# Relationship history for MSHA mine 4606057

Current hierarchy: **Sopsher William → Big Creek Mining Company → Mine No 2**

- 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:** Sopsher William → Mine No 2; 1979-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Creek Mining Company → Mine No 2; 1979-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sopsher William → Big Creek Mining Company; 1979-09-01 to current/open; source msha-controller-operator-history