# Relationship history for MSHA mine 2003323

Current hierarchy: **Daniel R  Balkema; Ralph T  Balkema → Aggregate Resources Inc → Aggregate Resources- Gun River**

- 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:** Daniel R  Balkema et al → Aggregate Resources- Gun River; 2002-01-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gun River Sand & Gravel → Aggregate Resources- Gun River; 2005-06-27 to 2007-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Stephen L  Oetman et al → Aggregate Resources- Gun River; 2005-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen L  Oetman et al → Gun River Sand & Gravel; 2005-06-27 to 2007-05-13; source msha-controller-operator-history
- **controller_controls_operator:** D & D Companies LLC et al → Gun River Sand & Gravel; 2005-06-27 to 2007-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Resources Inc → Aggregate Resources- Gun River; 2007-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Balkema et al → Aggregate Resources Inc; 2007-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph T  Balkema et al → Aggregate Resources Inc; 2007-05-14 to current/open; source msha-controller-operator-history