# Relationship history for MSHA mine 3303966

Current hierarchy: **Zuspan Velma G → Raven Hocking Coal Corp → Raven 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

- **controller_controls_mine:** Zuspan William F → Raven Dock; 1979-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Raven Hocking Coal Corp → Raven Dock; 1984-02-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Zuspan William F → Raven Hocking Coal Corp; 1984-02-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Raven Hocking Coal Corp → Raven Dock; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zuspan Velma G → Raven Dock; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zuspan Velma G → Raven Hocking Coal Corp; 1988-01-01 to current/open; source msha-controller-operator-history