# Relationship history for MSHA mine 1512550

Current hierarchy: **Smith William Keith → Circle S Coal Company Inc → Circle S Coal Co Inc Jericho 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Smith William Keith → Circle S Coal Co Inc Jericho Mine; 1974-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Circle S Coal Company Inc → Circle S Coal Co Inc Jericho Mine; 1980-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith William Keith → Circle S Coal Company Inc; 1980-10-01 to current/open; source msha-controller-operator-history