# Relationship history for MSHA mine 4104219

Current hierarchy: **Roy  Beken → Richmond Material Company → RICHMOND MATERIAL CO**

- 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

- **operator_operates_mine:** Richmond Material Company → RICHMOND MATERIAL CO; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Beken → RICHMOND MATERIAL CO; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Beken → Richmond Material Company; 2000-10-01 to current/open; source msha-controller-operator-history