# Relationship history for MSHA mine 4405640

Current hierarchy: **Johnson Ersel → Sher-Mel Coal Company Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Roberts Kenes P Jr & Sr → No 1; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Coal Company → No 1; 1981-05-01 to 1982-01-20; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Kenes P Jr & Sr → Eastern Coal Company; 1981-05-01 to 1982-01-20; source msha-controller-operator-history
- **operator_operates_mine:** Dove Coal Company Inc → No 1; 1982-01-21 to 1982-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Smith Paul → No 1; 1982-01-21 to 1982-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Smith Paul → Dove Coal Company Inc; 1982-01-21 to 1982-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Sher-Mel Coal Company Inc → No 1; 1982-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Ersel → No 1; 1982-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Ersel → Sher-Mel Coal Company Inc; 1982-04-06 to current/open; source msha-controller-operator-history