# Relationship history for MSHA mine 1512311

Current hierarchy: **Fred J  Cassetty → Owensboro Coal Dock Inc → Owensboro Coal Dock**

- 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:** Owensboro Riverport Authority → Owensboro Coal Dock; 1980-02-01 to 1984-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Owensboro Riverport Authority → Owensboro Coal Dock; 1980-02-01 to 1984-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Owensboro Riverport Authority → Owensboro Riverport Authority; 1980-02-01 to 1984-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Owensboro Coal Dock Inc → Owensboro Coal Dock; 1984-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred J  Cassetty → Owensboro Coal Dock; 1984-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred J  Cassetty → Owensboro Coal Dock Inc; 1984-08-30 to current/open; source msha-controller-operator-history