# Relationship history for MSHA mine 2401933

Current hierarchy: **Brown Michael R-J Vince Karp → Tail Holt Mining → Tail Holt**

- 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:** Tail Holt Mining → Tail Holt; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown Michael R-J Vince Karp Et Al → Tail Holt; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Michael R-J Vince Karp Et Al → Tail Holt Mining; 1990-10-01 to current/open; source msha-controller-operator-history