# Relationship history for MSHA mine 4503001

Current hierarchy: **Windsock Farms & Excavations → Windsock Farms & Excavations → Windsock Pit**

- 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:** Windsock Farms & Excavations → Windsock Pit; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Windsock Farms & Excavations → Windsock Pit; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Windsock Farms & Excavations → Windsock Farms & Excavations; 1983-04-01 to current/open; source msha-controller-operator-history