# Relationship history for MSHA mine 3609504

Current hierarchy: **William T  Bennett → William T Bennett Flagstone → William Bennett Flagstone**

- 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:** William T  Bennett → William Bennett Flagstone; 1998-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** William T Bennett Flagstone → William Bennett Flagstone; 2007-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William T  Bennett → William T Bennett Flagstone; 2007-04-12 to current/open; source msha-controller-operator-history