# Relationship history for MSHA mine 2003434

Current hierarchy: **Stephen H  Hartman → Stephen Hartman Excavating, Inc. → Pioneer Wash 412**

- 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:** Stephen Hartman Exc. Inc. → Pioneer Wash 412; 2009-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen H  Hartman → Pioneer Wash 412; 2009-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen H  Hartman → Stephen Hartman Exc. Inc.; 2009-09-02 to current/open; source msha-controller-operator-history