# Relationship history for MSHA mine 3607506

Current hierarchy: **Paul  Ferlitch → Ferlitch Construction 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

- **operator_operates_mine:** Ferlitch & Sons → Round Knob; 1983-10-01 to 2003-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Ferlitch John → Round Knob; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ferlitch John → Ferlitch & Sons; 1983-10-01 to 2003-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Ferlitch Construction Inc → Round Knob; 2003-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Ferlitch → Round Knob; 2003-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Ferlitch → Ferlitch Construction Inc; 2003-06-30 to current/open; source msha-controller-operator-history