# Relationship history for MSHA mine 1103167

Current hierarchy: **Ron E  Swenson; Mark A  Robinson → Rubloff Excavation, LLC → Plant 1**

- 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:** Rock River Stone LLC → Plant 1; 2006-06-05 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mark A  Robinson et al → Plant 1; 2006-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark A  Robinson et al → Rock River Stone LLC; 2006-06-05 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ron E  Swenson et al → Rock River Stone LLC; 2006-06-05 to 2007-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Rubloff Excavation, LLC → Plant 1; 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark A  Robinson et al → Plant 1; 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark A  Robinson et al → Rubloff Excavation, LLC; 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron E  Swenson et al → Rubloff Excavation, LLC; 2008-01-01 to current/open; source msha-controller-operator-history