# Relationship history for MSHA mine 4300601

Current hierarchy: **Robert  Tatko → Tatko Stone Products → Bush Quarry-North American Slate**

- 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:** Tatko Stone Products → Bush Quarry-North American Slate; 2004-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Tatko → Bush Quarry-North American Slate; 2004-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Tatko → Tatko Stone Products; 2004-01-22 to current/open; source msha-controller-operator-history