# Relationship history for MSHA mine 4000786

Current hierarchy: **Rogers Group Inc → Rogers Group, Inc. → RGI Cumberland Mountain Sand**

- 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:** Cumberland Mountain Sand Company Inc → RGI Cumberland Mountain Sand; 1950-01-01 to 1986-06-29; source msha-controller-operator-history
- **controller_controls_mine:** General Shale Products Corp → RGI Cumberland Mountain Sand; 1950-01-01 to 1986-06-29; source msha-controller-operator-history
- **controller_controls_operator:** General Shale Products Corp → Cumberland Mountain Sand Company Inc; 1950-01-01 to 1986-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Group Inc → RGI Cumberland Mountain Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland Mountain Sand Company → RGI Cumberland Mountain Sand; 1986-06-30 to 2000-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Marley Plc → RGI Cumberland Mountain Sand; 1986-06-30 to 2000-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Marley Plc → Cumberland Mountain Sand Company; 1986-06-30 to 2000-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland Mtn Sand Co → RGI Cumberland Mountain Sand; 2000-10-13 to 2004-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → RGI Cumberland Mountain Sand; 2000-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → Cumberland Mtn Sand Co; 2000-10-13 to 2004-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group, Inc. → RGI Cumberland Mountain Sand; 2004-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group, Inc.; 2004-11-14 to current/open; source msha-controller-operator-history