# Relationship history for MSHA mine 3401579

Current hierarchy: **Payne Dwight → D-D Oilfield Construction → Dwight'S 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:** D-D Oilfield Construction → Dwight'S Pit; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Payne Dwight → Dwight'S Pit; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Payne Dwight → D-D Oilfield Construction; 1986-11-01 to current/open; source msha-controller-operator-history