# Relationship history for MSHA mine 4801251

Current hierarchy: **Fred C  Hanson Jr; Geneva M  Hanson → Canyon Concrete & Excavating Inc → Brown Pit**

- 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:** Canyon Concrete & Excavating Inc → Brown Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Geneva M  Hanson  et al → Brown Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geneva M  Hanson  et al → Canyon Concrete & Excavating Inc; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred C  Hanson Jr  et al → Canyon Concrete & Excavating Inc; 1979-01-01 to current/open; source msha-controller-operator-history