# Relationship history for MSHA mine 4703490

Current hierarchy: **Edmund J  Gersek → Gersek Excavating LLC → Crushing Plant #601**

- 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:** Edmund J  Gersek → Crushing Plant #601; 2006-06-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gersek Excavating LLC → Crushing Plant #601; 2006-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edmund J  Gersek → Gersek Excavating LLC; 2006-10-30 to current/open; source msha-controller-operator-history