# Relationship history for MSHA mine 4406663

Current hierarchy: **Vandyke Leon & James Messer → River Bend Mining Inc → No 4 Mine**

- 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:** United  Company → No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vandyke Leon & James Messer → No 4 Mine; 1987-06-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 4 Mine; 1991-08-01 to 1991-11-20; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1991-08-01 to 1991-11-20; source msha-controller-operator-history
- **operator_operates_mine:** River Bend Mining Inc → No 4 Mine; 1991-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vandyke Leon & James Messer → River Bend Mining Inc; 1991-11-21 to current/open; source msha-controller-operator-history