# Relationship history for MSHA mine 1201897

Current hierarchy: **Rogers Group Inc → Rogers Group Inc → Arlen #1 Mine**

- 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:** Black Beauty Coal Company Inc → Arlen #1 Mine; 1982-08-01 to 1985-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Black Beauty Resources → Arlen #1 Mine; 1982-08-01 to 1990-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Black Beauty Resources → Black Beauty Coal Company Inc; 1982-08-01 to 1985-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Group Inc → Arlen #1 Mine; 1983-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc → Arlen #1 Mine; 1985-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc; 1985-09-20 to current/open; source msha-controller-operator-history