# Relationship history for MSHA mine 4000006

Current hierarchy: **Rogers Group Inc → Rogers Group Inc → LIBERTY 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 → LIBERTY QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & B Stone Company → LIBERTY QUARRY; 1950-01-01 to 1991-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Cecil  Bottoms → LIBERTY QUARRY; 1950-01-01 to 1991-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Cecil  Bottoms → B & B Stone Company; 1950-01-01 to 1991-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc → LIBERTY QUARRY; 1991-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc; 1991-05-08 to current/open; source msha-controller-operator-history