# Relationship history for MSHA mine 3200916

Current hierarchy: **Shawn  Harper → Diamondback Excavation Inc. → Wayne Herman 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

- **operator_operates_mine:** Diamondback Excavation Inc. → Wayne Herman Pit; 2011-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shawn  Harper → Wayne Herman Pit; 2011-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shawn  Harper → Diamondback Excavation Inc.; 2011-09-28 to current/open; source msha-controller-operator-history