# Relationship history for MSHA mine 4105659

Current hierarchy: **John D  Ramming → Rambo Materials LLC → Rambo Materials**

- 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:** Rambo Materials LLC → Rambo Materials; 2023-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John D  Ramming → Rambo Materials; 2023-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Ramming → Rambo Materials LLC; 2023-01-04 to current/open; source msha-controller-operator-history