# Relationship history for MSHA mine 4606569

Current hierarchy: **Winsor Curt → Winsor Pitman Coal Company → Lady Monica**

- 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:** Winsor Pitman Coal Company → Lady Monica; 1982-08-01 to 1983-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Winsor Curt → Lady Monica; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Winsor Curt → Winsor Pitman Coal Company; 1982-08-01 to 1983-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Spring Sewell Coal Company → Lady Monica; 1983-10-25 to 1984-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Robert H → Lady Monica; 1983-10-25 to 1984-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Robert H → Spring Sewell Coal Company; 1983-10-25 to 1984-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Winsor Pitman Coal Company → Lady Monica; 1984-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Winsor Curt → Winsor Pitman Coal Company; 1984-03-19 to current/open; source msha-controller-operator-history