# Relationship history for MSHA mine 2602660

Current hierarchy: **Paul L  Wilson; Grant B  Smith → Silver Springs Aggregates LLC → Silver Springs Plant**

- 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:** Silver Springs Aggregates LLC → Silver Springs Plant; 2009-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grant B  Smith et al → Silver Springs Plant; 2009-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grant B  Smith et al → Silver Springs Aggregates LLC; 2009-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul L  Wilson et al → Silver Springs Aggregates LLC; 2009-02-16 to current/open; source msha-controller-operator-history