# Relationship history for MSHA mine 1510641

Current hierarchy: **Wellman Danny & Rush Sanders → S & W Coal Company → No 7 Mine**

- 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:** Chain Link Coal Company Inc → No 7 Mine; 1977-08-01 to 1977-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Moore Larry A → No 7 Mine; 1977-08-01 to 1977-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Moore Larry A → Chain Link Coal Company Inc; 1977-08-01 to 1977-11-09; source msha-controller-operator-history
- **operator_operates_mine:** S & W Coal Company → No 7 Mine; 1977-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wellman Danny & Rush Sanders → No 7 Mine; 1977-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wellman Danny & Rush Sanders → S & W Coal Company; 1977-11-10 to current/open; source msha-controller-operator-history