# Relationship history for MSHA mine 2103791

Current hierarchy: **Don  Redman; Sue  Redman → Medford Sand and Gravel LLC → Dundas 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Sue  Redman et al → Dundas Wash Plant; 2011-08-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medford Sand and Gravel LLC → Dundas Wash Plant; 2013-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sue  Redman et al → Medford Sand and Gravel LLC; 2013-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Redman et al → Medford Sand and Gravel LLC; 2013-03-27 to current/open; source msha-controller-operator-history