# Relationship history for MSHA mine 4800291

Current hierarchy: **Seahorn Earl S → Seahorn Brothers → Seahorn Brothers 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Seahorn Brothers → Seahorn Brothers Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Seahorn Earl S → Seahorn Brothers Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Seahorn Earl S → Seahorn Brothers; 1950-01-01 to current/open; source msha-controller-operator-history