# Relationship history for MSHA mine 4702955

Current hierarchy: **Lynda  Somers → Somers Aggregates LTD → WP-820**

- 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:** Somers Aggregates LTD → WP-820; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lynda  Somers → WP-820; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynda  Somers → Somers Aggregates LTD; 1992-06-01 to current/open; source msha-controller-operator-history