# Relationship history for MSHA mine 4300439

Current hierarchy: **John M  Williams → Newmont Slate Company Inc → SOUTH POULTNEY QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Newmont Slate Company Inc → SOUTH POULTNEY QUARRY; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Williams → SOUTH POULTNEY QUARRY; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Williams → Newmont Slate Company Inc; 1989-10-01 to current/open; source msha-controller-operator-history