# Relationship history for MSHA mine 3304405

Current hierarchy: **Kevin R  Steward → Darby Creek Excavating, Inc. → Darby Creek**

- 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:** Darby Creek Excavating, Inc. → Darby Creek; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin R  Steward → Darby Creek; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin R  Steward → Darby Creek Excavating, Inc.; 1997-11-01 to current/open; source msha-controller-operator-history