# Relationship history for MSHA mine 4000061

Current hierarchy: **Rogers Group Inc → Rogers Group Inc → Rutherford 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

- **operator_operates_mine:** Stone Man Inc → Rutherford Quarry; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Rutherford Quarry; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Stone Man Inc; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Group Inc → Rutherford Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Stone Man Inc → Rutherford Quarry; 1988-11-14 to 2000-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Rutherford Quarry; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Stone Man Inc; 1988-11-14 to 2000-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc → Rutherford Quarry; 2000-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc; 2000-12-04 to current/open; source msha-controller-operator-history