# Relationship history for MSHA mine 4105056

Current hierarchy: **John R  Fehr → Fehr's Metal Building Construction LLC. → 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

- **operator_operates_mine:** Fehr's Metal Building Construction LLC. → Knox Pit; 2014-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Fehr → Knox Pit; 2014-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Fehr → Fehr's Metal Building Construction LLC.; 2014-02-24 to current/open; source msha-controller-operator-history