# Relationship history for MSHA mine 2103900

Current hierarchy: **Matthew  DeCaigny; Amy  DeCaigny → Decaigny Excavating Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Decaigny Excavating Inc → Wash Plant; 2017-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amy  DeCaigny et al → Wash Plant; 2017-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amy  DeCaigny et al → Decaigny Excavating Inc; 2017-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  DeCaigny et al → Decaigny Excavating Inc; 2017-04-20 to current/open; source msha-controller-operator-history