# Relationship history for MSHA mine 3607666

Current hierarchy: **Larry D  Baumgardner → Larry D Baumgardner Coal Company Inc → Drifting**

- 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

- **controller_controls_mine:** Larry D  Baumgardner → Drifting; 1984-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Larry D Baumgardner Coal Company Inc → Drifting; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry D  Baumgardner → Larry D Baumgardner Coal Company Inc; 1985-02-01 to current/open; source msha-controller-operator-history