# Relationship history for MSHA mine 1515790

Current hierarchy: **Shelby L  Wilson → Lee W Coal Company Inc → No 4**

- 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

- **controller_controls_mine:** Shelby L  Wilson et al → No 4; 1984-09-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lee W Coal Company Inc → No 4; 1986-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shelby L  Wilson et al → Lee W Coal Company Inc; 1986-10-01 to current/open; source msha-controller-operator-history