# Relationship history for MSHA mine 3605531

Current hierarchy: **Stefan William J Jr → Bentley Coal Company Inc → Mine No 9**

- 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:** Bentley Coal Company Inc → Mine No 9; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stefan William J Jr → Mine No 9; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stefan William J Jr → Bentley Coal Company Inc; 1974-08-01 to current/open; source msha-controller-operator-history