# Relationship history for MSHA mine 3609578

Current hierarchy: **Paul  Ferlitch → Ferlitch Construction Company Inc → Round Knob**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Paul  Ferlitch → Round Knob; 2003-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ferlitch Construction Company Inc → Round Knob; 2007-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Ferlitch → Ferlitch Construction Company Inc; 2007-12-16 to current/open; source msha-controller-operator-history