# Relationship history for MSHA mine 2103813

Current hierarchy: **Royal J  Johnson Jr; Matthew  Johnson → Rochester Asphalt & Concrete → Rochester Asphalt & Concrete**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Rochester Asphalt & Concrete → Rochester Asphalt & Concrete; 2013-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Johnson et al → Rochester Asphalt & Concrete; 2013-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Johnson et al → Rochester Asphalt & Concrete; 2013-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Royal J  Johnson Jr et al → Rochester Asphalt & Concrete; 2013-09-18 to current/open; source msha-controller-operator-history