# Relationship history for MSHA mine 3304018

Current hierarchy: **Rick B Winegardner → Sharon Stone Company → Sharon Stone 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:** Sharon Stone Company → Sharon Stone Company; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John P  McCort → Sharon Stone Company; 1985-05-01 to 2019-01-13; source msha-controller-operator-history
- **controller_controls_operator:** John P  McCort → Sharon Stone Company; 1985-05-01 to 2019-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Rick B Winegardner → Sharon Stone Company; 2019-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick B Winegardner → Sharon Stone Company; 2019-01-14 to current/open; source msha-controller-operator-history