# Relationship history for MSHA mine 4407423

Current hierarchy: **Robin Roy Belcher → P B DIRT MOVERS INC. → AUGER 10**

- 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 → AUGER 10; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P B DIRT MOVERS INC. → AUGER 10; 2023-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robin Roy Belcher → P B DIRT MOVERS INC.; 2023-01-22 to current/open; source msha-controller-operator-history