# Relationship history for MSHA mine 4602723

Current hierarchy: **Justice Eugene → United Coal Company → No 6 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** United Coal Company → No 6 Mine; 1950-01-01 to 1975-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Garland Robert L → No 6 Mine; 1950-01-01 to 1987-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Garland Robert L → United Coal Company; 1950-01-01 to 1975-08-07; source msha-controller-operator-history
- **operator_operates_mine:** United Coal Company → No 6 Mine; 1975-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justice Eugene → No 6 Mine; 1975-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justice Eugene → United Coal Company; 1975-08-08 to current/open; source msha-controller-operator-history