# Relationship history for MSHA mine 1901158

Current hierarchy: **Scott T  McKnight → McKnight Excavating → McKnight Excavation**

- 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:** McKnight Excavating → McKnight Excavation; 2006-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott T  McKnight → McKnight Excavation; 2006-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott T  McKnight → McKnight Excavating; 2006-10-18 to current/open; source msha-controller-operator-history