# Relationship history for MSHA mine 3503500

Current hierarchy: **Terry W  Duman → Duman Inc → Camp Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Duman Inc → Camp Quarry; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry W  Duman → Camp Quarry; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry W  Duman → Duman Inc; 2000-06-01 to current/open; source msha-controller-operator-history