# Relationship history for MSHA mine 4703411

Current hierarchy: **Leo B  Meverden → Meverden Materials Inc. → Rib Mt.**

- 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 → Rib Mt.; 1994-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meverden Materials Inc. → Rib Mt.; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leo B  Meverden → Meverden Materials Inc.; 2005-01-01 to current/open; source msha-controller-operator-history