# Relationship history for MSHA mine 4608260

Current hierarchy: **Thurman C  Cline → Black Bear Mining Inc → No 4**

- 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:** Thurman C  Cline → No 4; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Bear Mining Inc → No 4; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thurman C  Cline → Black Bear Mining Inc; 1992-12-01 to current/open; source msha-controller-operator-history