# Relationship history for MSHA mine 4703778

Current hierarchy: **Paul A  Loppnow → Hard Rock Crushing LLC → HRC Screen 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

- **controller_controls_mine:** Paul A  Loppnow → HRC Screen Plant; 2013-07-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Crushing LLC → HRC Screen Plant; 2016-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul A  Loppnow → Hard Rock Crushing LLC; 2016-04-11 to current/open; source msha-controller-operator-history