# Relationship history for MSHA mine 3605365

Current hierarchy: **Fetterolf Harvey → Four-Par Coal Company → East Drift**

- 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:** Four-Par Coal Company → East Drift; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fetterolf Harvey → East Drift; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fetterolf Harvey → Four-Par Coal Company; 1974-11-01 to current/open; source msha-controller-operator-history