# Relationship history for MSHA mine 4300033

Current hierarchy: **John M  Tatko Jr → SHELDON SLATE PRODUCTS CO., INC. → SHELDON SLATE PRODUCTS QRY & MILL #2**

- 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 Brothers Slate Company Inc → SHELDON SLATE PRODUCTS QRY & MILL #2; 1950-01-01 to 2013-02-11; source msha-controller-operator-history
- **controller_controls_mine:** John M  Tatko Jr → SHELDON SLATE PRODUCTS QRY & MILL #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Tatko Jr → Tatko Brothers Slate Company Inc; 1950-01-01 to 2013-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Sheldon Slate Products Co., Inc. → SHELDON SLATE PRODUCTS QRY & MILL #2; 2013-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Tatko Jr → Sheldon Slate Products Co., Inc.; 2013-02-12 to current/open; source msha-controller-operator-history