# Relationship history for MSHA mine 2103571

Current hierarchy: **John R  Maciej; Joseph A  Maciej → Hard Rock Screening LLC → Wash Plant**

- 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 Screening LLC → Wash Plant; 2007-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Maciej  et al → Wash Plant; 2007-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Maciej  et al → Hard Rock Screening LLC; 2007-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph A  Maciej  et al → Hard Rock Screening LLC; 2007-04-16 to current/open; source msha-controller-operator-history