# Relationship history for MSHA mine 2800393

Current hierarchy: **Flaherty William E → New Jersey Zinc Company Inc → Sterling Mine & Mill**

- 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:** New Jersey Zinc Company → Sterling Mine & Mill; 1950-01-01 to 1981-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Gulf + Western Industries Inc → Sterling Mine & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc → New Jersey Zinc Company; 1950-01-01 to 1981-10-29; source msha-controller-operator-history
- **operator_operates_mine:** New Jersey Zinc Company Inc → Sterling Mine & Mill; 1981-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Flaherty William E → Sterling Mine & Mill; 1981-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Flaherty William E → New Jersey Zinc Company Inc; 1981-10-30 to current/open; source msha-controller-operator-history