# Relationship history for MSHA mine 2800522

Current hierarchy: **Christine H  Yackman → Pinnacle Materials Inc → East Brunswick**

- 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:** Herbert Sand Company Inc → East Brunswick; 1950-01-01 to 1996-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Harold D  Herbert → East Brunswick; 1950-01-01 to 1996-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Harold D  Herbert → Herbert Sand Company Inc; 1950-01-01 to 1996-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Pinnacle Materials Inc → East Brunswick; 1996-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christine H  Yackman → East Brunswick; 1996-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christine H  Yackman → Pinnacle Materials Inc; 1996-08-16 to current/open; source msha-controller-operator-history