# Relationship history for MSHA mine 0300855

Current hierarchy: **Rogers Group Inc → Rogers Group Inc → Greenbrier Quarry**

- 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

- **controller_controls_mine:** Rogers Group Inc → Greenbrier Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & M Rock Company Inc → Greenbrier Quarry; 1950-01-01 to 1996-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Jay P  McConnell et al → Greenbrier Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay P  McConnell et al → M & M Rock Company Inc; 1950-01-01 to 1996-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Mc Connell et al → M & M Rock Company Inc; 1950-01-01 to 1996-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc → Greenbrier Quarry; 1996-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc; 1996-10-07 to current/open; source msha-controller-operator-history