# Relationship history for MSHA mine 4300641

Current hierarchy: **Michael J  Tatko Jr → Global Slate Inc → Wells Bullfrog 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

- **controller_controls_mine:** Michael J  Tatko Jr → Wells Bullfrog Quarry; 1999-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Global Slate Inc → Wells Bullfrog Quarry; 2005-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  Tatko Jr → Global Slate Inc; 2005-08-01 to current/open; source msha-controller-operator-history