# Relationship history for MSHA mine 4407379

Current hierarchy: **Robin Roy Belcher → P B Dirt Movers, Inc. → No. 3**

- 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:** Robin Roy Belcher → No. 3; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P B Dirt Movers, Inc. → No. 3; 2017-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robin Roy Belcher → P B Dirt Movers, Inc.; 2017-11-01 to current/open; source msha-controller-operator-history