# Relationship history for MSHA mine 4607924

Current hierarchy: **Young John P → Toy Coal Company → Hewitt Fork No 1**

- 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:** Young John P → Hewitt Fork No 1; 1989-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Toy Coal Company → Hewitt Fork No 1; 1990-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Young John P → Toy Coal Company; 1990-08-01 to current/open; source msha-controller-operator-history