# Relationship history for MSHA mine 3901499

Current hierarchy: **Ronnie J  Zebroski → K L M Exco → K L M Exco**

- 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

- **operator_operates_mine:** Rexco LLC → K L M Exco; 2004-09-24 to 2007-10-02; source msha-controller-operator-history
- **controller_controls_mine:** James S  Christensen et al → K L M Exco; 2004-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James S  Christensen et al → Rexco LLC; 2004-09-24 to 2007-10-02; source msha-controller-operator-history
- **operator_operates_mine:** K L M Exco → K L M Exco; 2007-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie J  Zebroski → K L M Exco; 2007-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie J  Zebroski → K L M Exco; 2007-10-03 to current/open; source msha-controller-operator-history