# Relationship history for MSHA mine 1512176

Current hierarchy: **Cyprus Amax Minerals Company → Star Fire Mining Company → #1 Maintenance Shop**

- 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:** Mountain Coals Inc → #1 Maintenance Shop; 1977-10-04 to 1981-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Star Fire Coals Inc → #1 Maintenance Shop; 1979-12-01 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Mountain Coals Inc → Star Fire Coals Inc; 1979-12-01 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → #1 Maintenance Shop; 1981-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Star Fire Mining Company → #1 Maintenance Shop; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Star Fire Mining Company; 1981-09-15 to current/open; source msha-controller-operator-history