# Relationship history for MSHA mine 0801023

Current hierarchy: **De Lamar Luis J → Rock Works Inc → Best Rock**

- 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:** Loyal Rock Inc → Best Rock; 1984-11-01 to 1988-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Borron Celestino → Best Rock; 1984-11-01 to 1988-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Borron Celestino → Loyal Rock Inc; 1984-11-01 to 1988-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Rock Works Inc → Best Rock; 1988-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Lamar Luis J → Best Rock; 1988-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Lamar Luis J → Rock Works Inc; 1988-01-19 to current/open; source msha-controller-operator-history