# Relationship history for MSHA mine 2402776

Current hierarchy: **Christopher J  Noble → Noble Excavating, Inc → Portable Screen #3**

- 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:** Christopher J  Noble → Portable Screen #3; 2005-04-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Noble Excavating, Inc → Portable Screen #3; 2022-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher J  Noble → Noble Excavating, Inc; 2022-03-21 to current/open; source msha-controller-operator-history