# Relationship history for MSHA mine 3004188

Current hierarchy: **Richard  Robinson; Lyndon  Robinson → Robinson Bros. → Robinson Bros.**

- 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:** Lyndon  Robinson  et al → Robinson Bros.; 1989-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Robinson Bros. → Robinson Bros.; 2026-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lyndon  Robinson  et al → Robinson Bros.; 2026-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Robinson et al → Robinson Bros.; 2026-06-05 to current/open; source msha-controller-operator-history