# Relationship history for MSHA mine 3605881

Current hierarchy: **Bologna Ray → Bologna Mining Company → Fayette County Strips**

- 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:** Bologna Ray → Fayette County Strips; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bologna Mining Company → Fayette County Strips; 1975-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bologna Ray → Bologna Mining Company; 1975-11-15 to current/open; source msha-controller-operator-history