# Relationship history for MSHA mine 3606819

Current hierarchy: **Broda John--Joseph Sotonak & Vincent Guorna Jr → Western Excavating Company → No 1 Pit Strip**

- 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:** Western Excavating Company → No 1 Pit Strip; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Broda John--Joseph Sotonak & Vincent Guorna Jr → No 1 Pit Strip; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Broda John--Joseph Sotonak & Vincent Guorna Jr → Western Excavating Company; 1979-04-01 to current/open; source msha-controller-operator-history