# Relationship history for MSHA mine 4703947

Current hierarchy: **Leo B  Meverden → Meverden Materials, Inc. → Sandvik Screen**

- 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:** Leo B  Meverden → Sandvik Screen; 1994-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** MEVERDEN MATERIALS, INC. → Sandvik Screen; 2023-08-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leo B  Meverden → MEVERDEN MATERIALS, INC.; 2023-08-22 to current/open; source msha-controller-operator-history