# Relationship history for MSHA mine 4608203

Current hierarchy: **John T  Markovich → M & J Coal Company Inc → Williams Iii**

- 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

- **controller_controls_mine:** John T  Markovich → Williams Iii; 1985-10-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & J Coal Company Inc → Williams Iii; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Markovich → M & J Coal Company Inc; 1992-08-01 to current/open; source msha-controller-operator-history