# Relationship history for MSHA mine 3608411

Current hierarchy: **Reading Energy Group Inc → Northeastern Power Company → Silverbrook Buck Stripping**

- 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:** Northeastern Power Company → Silverbrook Buck Stripping; 1993-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reading Energy Group Inc → Silverbrook Buck Stripping; 1993-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reading Energy Group Inc → Northeastern Power Company; 1993-11-01 to current/open; source msha-controller-operator-history