# Relationship history for MSHA mine 3901649

Current hierarchy: **Robert L Winter; Nicholas R Winter → Winter Contracting LLC → Whitehead 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:** Winter Contracting LLC → Whitehead Pit; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert L Winter et al → Whitehead Pit; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L Winter et al → Winter Contracting LLC; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas R Winter et al → Winter Contracting LLC; 2020-05-11 to current/open; source msha-controller-operator-history