# Relationship history for MSHA mine 3304387

Current hierarchy: **John  Nicolozakes → Marietta Coal Company → Jefferson County Strip**

- 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  Nicolozakes et al → Jefferson County Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nike Mining Co. Inc. → Jefferson County Strip; 1997-01-01 to 2004-05-12; source msha-controller-operator-history
- **controller_controls_mine:** John  Nicolozakes et al → Jefferson County Strip; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Nicolozakes et al → Nike Mining Co. Inc.; 1997-01-01 to 2004-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Marietta Coal Company → Jefferson County Strip; 2004-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Nicolozakes et al → Marietta Coal Company; 2004-05-13 to current/open; source msha-controller-operator-history