# Relationship history for MSHA mine 4801745

Current hierarchy: **Benjamin A  Barnum → Barnum Construction Services LLC → Screen 1**

- 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:** Barnum Construction Services LLC → Screen 1; 2009-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin A  Barnum → Screen 1; 2009-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin A  Barnum → Barnum Construction Services LLC; 2009-10-31 to current/open; source msha-controller-operator-history