# Relationship history for MSHA mine 0301423

Current hierarchy: **Oscar  Cozzini → RH Preyda Company → Hall'S Oilstone Mill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Hall'S Arkansas Oilstone Inc → Hall'S Oilstone Mill; 1979-01-01 to 2013-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Hall Richard L → Hall'S Oilstone Mill; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Richard L → Hall'S Arkansas Oilstone Inc; 1979-01-01 to 2013-05-21; source msha-controller-operator-history
- **operator_operates_mine:** RH Preyda Company → Hall'S Oilstone Mill; 2013-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oscar  Cozzini → Hall'S Oilstone Mill; 2013-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oscar  Cozzini → RH Preyda Company; 2013-05-22 to current/open; source msha-controller-operator-history