# Relationship history for MSHA mine 4002564

Current hierarchy: **Hicks Ray → Universal Coal Company → #1 Tipple**

- 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:** Hicks Ray Et Al → #1 Tipple; 1979-05-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Universal Coal Company → #1 Tipple; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hicks Ray Et Al → Universal Coal Company; 1979-11-01 to current/open; source msha-controller-operator-history