# Relationship history for MSHA mine 4105397

Current hierarchy: **Dustin  Bailey; Stephen  Greak → ETX Proppants LLC → HRS-Penwell**

- 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:** ETX Proppants LLC → HRS-Penwell; 2018-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dustin  Bailey et al → HRS-Penwell; 2018-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dustin  Bailey et al → ETX Proppants LLC; 2018-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Greak et al → ETX Proppants LLC; 2018-11-05 to current/open; source msha-controller-operator-history