# Relationship history for MSHA mine 2602917

Current hierarchy: **Daniel E Groth → DV Gravel & Exploration LLC → Devil's Gate Pit**

- 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 E Groth → Devil's Gate Pit; 2014-06-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DV Gravel & Exploration LLC → Devil's Gate Pit; 2025-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel E Groth → DV Gravel & Exploration LLC; 2025-09-24 to current/open; source msha-controller-operator-history