# Relationship history for MSHA mine 0405818

Current hierarchy: **Charles G  Roe; Don John  Unmacht → Hard Rock Crushing Services Inc → Plant 1**

- 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:** Hard Rock Crushing Services Inc → Plant 1; 2011-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don John  Unmacht et al → Plant 1; 2011-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don John  Unmacht et al → Hard Rock Crushing Services Inc; 2011-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles G  Roe et al → Hard Rock Crushing Services Inc; 2011-01-20 to current/open; source msha-controller-operator-history