# Relationship history for MSHA mine 4202020

Current hierarchy: **Blaine J  Rees → Rees'S Enterprise → EL-JAY #748**

- 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:** Blaine J  Rees → EL-JAY #748; 1984-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rees'S Enterprise → EL-JAY #748; 1991-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blaine J  Rees → Rees'S Enterprise; 1991-09-01 to current/open; source msha-controller-operator-history