# Relationship history for MSHA mine 3102008

Current hierarchy: **Young Bobby R & Bill R → Toe River Stone & Gravel Inc → HASSETT**

- 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:** Toe River Stone & Gravel Inc → HASSETT; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Young Bobby R & Bill R → HASSETT; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Young Bobby R & Bill R → Toe River Stone & Gravel Inc; 1987-08-01 to current/open; source msha-controller-operator-history