# Relationship history for MSHA mine 5002028

Current hierarchy: **Dianne  Johnson; Owen S Johnson → Dirtworks, Inc. → Dirtworks, Inc.**

- 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:** Dirtworks, Inc. → Dirtworks, Inc.; 2015-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Owen S Johnson et al → Dirtworks, Inc.; 2015-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owen S Johnson et al → Dirtworks, Inc.; 2015-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dianne  Johnson et al → Dirtworks, Inc.; 2015-03-05 to current/open; source msha-controller-operator-history