# Relationship history for MSHA mine 4801806

Current hierarchy: **Ronald  Hackbarth; Jason  Bivens → River View Sand and Gravel → River View Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** River View Sand and Gravel → River View Sand and Gravel; 2017-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason  Bivens et al → River View Sand and Gravel; 2017-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Bivens et al → River View Sand and Gravel; 2017-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Hackbarth et al → River View Sand and Gravel; 2017-08-09 to current/open; source msha-controller-operator-history