# Relationship history for MSHA mine 3503708

Current hierarchy: **Donald H  Buford; Terry L  Clark → Dust Devil Mining Company → Dust Devil Mining Company**

- 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:** Dust Devil Mining Company → Dust Devil Mining Company; 2008-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry L  Clark et al → Dust Devil Mining Company; 2008-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Clark et al → Dust Devil Mining Company; 2008-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald H  Buford et al → Dust Devil Mining Company; 2008-09-17 to current/open; source msha-controller-operator-history