# Relationship history for MSHA mine 1202350

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

- 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:** Daniel R  Balkema et al → Aggregate Resources-Waverly; 2002-01-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Patriot Materials → Aggregate Resources-Waverly; 2003-06-17 to 2007-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Rick L Hartman → Aggregate Resources-Waverly; 2003-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick L Hartman → Patriot Materials; 2003-06-17 to 2007-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Resources Inc → Aggregate Resources-Waverly; 2007-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Balkema et al → Aggregate Resources Inc; 2007-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph T  Balkema et al → Aggregate Resources Inc; 2007-11-20 to current/open; source msha-controller-operator-history