# Relationship history for MSHA mine 1516466

Current hierarchy: **Coleman Ken → Big C Coal Company Inc → No 2**

- 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

- **controller_controls_mine:** Coleman Ken → No 2; 1988-03-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big C Coal Company Inc → No 2; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Ken → Big C Coal Company Inc; 1988-09-01 to current/open; source msha-controller-operator-history