# Relationship history for MSHA mine 3303904

Current hierarchy: **Kevin E  Thompson → K D Coal Company Inc → Baker Pit**

- 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:** K D Coal Company Inc → Baker Pit; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin E  Thompson → Baker Pit; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin E  Thompson → K D Coal Company Inc; 1982-07-01 to current/open; source msha-controller-operator-history