# Relationship history for MSHA mine 2103979

Current hierarchy: **Christopher  DeCook → Olmsted Aggregate → Three Deck Screener**

- 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:** Christopher  DeCook → Three Deck Screener; 2018-09-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Olmsted Aggregate → Three Deck Screener; 2020-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  DeCook → Olmsted Aggregate; 2020-06-23 to current/open; source msha-controller-operator-history