# Relationship history for MSHA mine 3607145

Current hierarchy: **Graziani Fred → G B Sand Company Inc → Dodds Pit**

- 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:** G B Sand Company Inc → Dodds Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Graziani Fred → Dodds Pit; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graziani Fred → G B Sand Company Inc; 1981-06-01 to current/open; source msha-controller-operator-history