# Relationship history for MSHA mine 2103800

Current hierarchy: **Cemstone Concrete Solutions → Dakota Aggregates, LLC → Dakota Aggregates Grubbing & Grading #2**

- 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:** Cemstone Concrete Solutions et al → Dakota Aggregates Grubbing & Grading #2; 2013-03-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Aggregates, LLC → Dakota Aggregates Grubbing & Grading #2; 2013-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemstone Concrete Solutions et al → Dakota Aggregates, LLC; 2013-05-17 to current/open; source msha-controller-operator-history