# Relationship history for MSHA mine 4606225

Current hierarchy: **John T  Markovich → M & J Coal Company Inc → M&J Coal Co Inc Mine #1**

- 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:** Pittsburgh Coal Works Inc → M&J Coal Co Inc Mine #1; 1980-08-01 to 1985-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Minnix Dann Et Al → M&J Coal Co Inc Mine #1; 1980-08-01 to 1985-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Minnix Dann Et Al → Pittsburgh Coal Works Inc; 1980-08-01 to 1985-10-24; source msha-controller-operator-history
- **operator_operates_mine:** M & J Coal Company Inc → M&J Coal Co Inc Mine #1; 1985-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John T  Markovich → M&J Coal Co Inc Mine #1; 1985-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Markovich → M & J Coal Company Inc; 1985-10-25 to current/open; source msha-controller-operator-history