# Relationship history for MSHA mine 3503515

Current hierarchy: **Eila  Kynsi → Kynsi Construction Inc → Screen 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

- **controller_controls_mine:** Eila  Kynsi et al → Screen Plant; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kynsi Construction Inc → Screen Plant; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eila  Kynsi et al → Kynsi Construction Inc; 2000-12-01 to current/open; source msha-controller-operator-history