# Relationship history for MSHA mine 3000854

Current hierarchy: **De Witt Melvin → Dewitt Brothers Sand & Gravel Inc → Dewitt 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:** Dewitt Brothers Sand & Gravel Inc → Dewitt Brothers Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Witt Melvin → Dewitt Brothers Sand And Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Witt Melvin → Dewitt Brothers Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history