# Relationship history for MSHA mine 5001550

Current hierarchy: **Robert C  Cook → Robert Cook → Robert Cook**

- 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:** Del Ackels → Robert Cook; 1980-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gold Dust Mines → Robert Cook; 1988-06-01 to 2012-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Del Ackels → Gold Dust Mines; 1988-06-01 to 2012-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Robert Cook → Robert Cook; 2012-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Cook → Robert Cook; 2012-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Cook → Robert Cook; 2012-03-18 to current/open; source msha-controller-operator-history