# Relationship history for MSHA mine 4105308

Current hierarchy: **John R  Fehr → Fehrs Metal Building Construction LP → Knox Pit**

- 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:** John R  Fehr → Knox Pit; 2014-02-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Contractors LP → Knox Pit; 2017-10-19 to 2025-04-21; source msha-controller-operator-history
- **controller_controls_mine:** John R  Fehr → Knox Pit; 2017-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Fehr → Southwest Contractors LP; 2017-10-19 to 2025-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Fehrs Metal Building Construction LP → Knox Pit; 2025-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Fehr → Fehrs Metal Building Construction LP; 2025-04-22 to current/open; source msha-controller-operator-history