# Relationship history for MSHA mine 2103405

Current hierarchy: **Dave J  Rybak → Rybak Aggregate, LLC → Excel 1500**

- 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:** William L Schuh → Excel 1500; 1996-05-01 to 2004-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Dave W Reimer et al → Excel 1500; 2004-02-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Custom Crushing & Screening → Excel 1500; 2004-02-18 to 2008-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Dave W Reimer et al → Custom Crushing & Screening; 2004-02-18 to 2008-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Richard K Whinnery et al → Custom Crushing & Screening; 2004-02-18 to 2008-05-18; source msha-controller-operator-history
- **controller_controls_operator:** William L Schuh → Custom Crushing & Screening; 2004-02-18 to 2004-02-08; source msha-controller-operator-history
- **operator_operates_mine:** Rybak Aggregate LLC → Excel 1500; 2008-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dave J  Rybak → Excel 1500; 2008-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave J  Rybak → Rybak Aggregate LLC; 2008-05-19 to current/open; source msha-controller-operator-history