# Relationship history for MSHA mine 4000011

Current hierarchy: **Singleton Marvin & John R Noland → Ross L Brown Cut Stone Company Inc → Ross L Brown Cut Stone Qry & Plant**

- 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:** Ross L Brown Cut Stone Company Inc → Ross L Brown Cut Stone Qry & Plant; 1950-01-01 to 1983-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Smith Barry T → Ross L Brown Cut Stone Qry & Plant; 1950-01-01 to 1983-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Smith Barry T → Ross L Brown Cut Stone Company Inc; 1950-01-01 to 1983-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Ross L Brown Cut Stone Company Inc → Ross L Brown Cut Stone Qry & Plant; 1983-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Singleton Marvin & John R Noland → Ross L Brown Cut Stone Qry & Plant; 1983-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Singleton Marvin & John R Noland → Ross L Brown Cut Stone Company Inc; 1983-12-14 to current/open; source msha-controller-operator-history