# Relationship history for MSHA mine 3303637

Current hierarchy: **Elam Oliver M Jr → Oliver M Elam Jr Company Inc → Elam Dock**

- 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:** Oliver M Elam Jr Company Inc → Elam Dock; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elam Oliver M Jr → Elam Dock; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elam Oliver M Jr → Oliver M Elam Jr Company Inc; 1977-08-01 to current/open; source msha-controller-operator-history