# Relationship history for MSHA mine 3605927

Current hierarchy: **Fast Ira W → Fast Coal Company → Fast Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Fast Coal Company → Fast Surface; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fast Ira W → Fast Surface; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fast Ira W → Fast Coal Company; 1976-01-01 to current/open; source msha-controller-operator-history