# Relationship history for MSHA mine 2103881

Current hierarchy: **Brent A Reiner → Riverview Aggregates → **Mobile Crushing Unit****

- 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:** Riverview Aggregates → **Mobile Crushing Unit**; 2016-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brent A Reiner → **Mobile Crushing Unit**; 2016-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent A Reiner → Riverview Aggregates; 2016-04-15 to current/open; source msha-controller-operator-history