# Relationship history for MSHA mine 2401728

Current hierarchy: **Miller William G → Rocky Mountain Construction Company → Deep Creek Placer**

- 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:** Westmont Development Inc → Deep Creek Placer; 1983-06-01 to 1985-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Nahels Vince → Deep Creek Placer; 1983-06-01 to 1985-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Nahels Vince → Westmont Development Inc; 1983-06-01 to 1985-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Mountain Construction Company → Deep Creek Placer; 1985-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Miller William G → Deep Creek Placer; 1985-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miller William G → Rocky Mountain Construction Company; 1985-06-14 to current/open; source msha-controller-operator-history