# Relationship history for MSHA mine 1514072

Current hierarchy: **Hall Kenneth → D & D Coal Company Inc → No 1 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:** D & D Coal Company Inc → No 1 Mine; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Kenneth → No 1 Mine; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Kenneth → D & D Coal Company Inc; 1983-06-01 to current/open; source msha-controller-operator-history