# Relationship history for MSHA mine 4606563

Current hierarchy: **Simpson Paul & William Wisen → Wisen-Simpson Ltd → Wisen**

- 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:** Wisen-Simpson Ltd → Wisen; 1982-08-01 to 1983-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Simpson Paul & William Wisen → Wisen; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simpson Paul & William Wisen → Wisen-Simpson Ltd; 1982-08-01 to 1983-05-15; source msha-controller-operator-history
- **operator_operates_mine:** N & T Coal Company → Wisen; 1983-05-16 to 1983-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Noone W H → Wisen; 1983-05-16 to 1983-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Noone W H → N & T Coal Company; 1983-05-16 to 1983-09-07; source msha-controller-operator-history
- **operator_operates_mine:** Wisen-Simpson Ltd → Wisen; 1983-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simpson Paul & William Wisen → Wisen-Simpson Ltd; 1983-09-08 to current/open; source msha-controller-operator-history