# Relationship history for MSHA mine 3606438

Current hierarchy: **Donald R  Hoffman → Hoffman Mining Inc → Hoffman No 1**

- 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:** Yantus Coal Company → Hoffman No 1; 1977-07-01 to 1988-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Yantus Steve → Hoffman No 1; 1977-07-01 to 1988-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Yantus Steve → Yantus Coal Company; 1977-07-01 to 1988-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Hoffman Mining Inc → Hoffman No 1; 1988-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Hoffman → Hoffman No 1; 1988-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Hoffman → Hoffman Mining Inc; 1988-09-09 to current/open; source msha-controller-operator-history