# Relationship history for MSHA mine 2602034

Current hierarchy: **Read Cliff → Park City Rock Products Inc → El Jay #742**

- 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 #742; 1984-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rees'S Enterprise → El Jay #742; 1987-11-01 to 1988-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Blaine J  Rees → Rees'S Enterprise; 1987-11-01 to 1988-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Park City Rock Products Inc → El Jay #742; 1988-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Read Cliff → El Jay #742; 1988-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Read Cliff → Park City Rock Products Inc; 1988-11-18 to current/open; source msha-controller-operator-history