# Relationship history for MSHA mine 2100578

Current hierarchy: **James  Osmundson → Osmundson Brothers Contractors Inc → Sand And Gravel**

- 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:** Osmundson Brothers Contractors Inc → Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Osmundson  et al → Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Osmundson  et al → Osmundson Brothers Contractors Inc; 1950-01-01 to current/open; source msha-controller-operator-history