# Relationship history for MSHA mine 3604151

Current hierarchy: **Creel Clarence & Arthur L → Rob Coal Company Inc → Rob Strip Mine**

- 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:** Rob Coal Company Inc → Rob Strip Mine; 1950-01-01 to 1982-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Altmire Brothers Coal Company Inc → Rob Strip Mine; 1950-01-01 to 1982-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Altmire Brothers Coal Company Inc → Rob Coal Company Inc; 1950-01-01 to 1982-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Rob Coal Company Inc → Rob Strip Mine; 1982-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Creel Clarence & Arthur L → Rob Strip Mine; 1982-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Creel Clarence & Arthur L → Rob Coal Company Inc; 1982-11-04 to current/open; source msha-controller-operator-history