# Relationship history for MSHA mine 3608471

Current hierarchy: **Smith William I → Willy Jo Mining Inc → Smith No 7 (Waltenbaugh)**

- 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:** Willy Jo Mining Inc → Smith No 7 (Waltenbaugh); 1994-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith William I → Smith No 7 (Waltenbaugh); 1994-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith William I → Willy Jo Mining Inc; 1994-06-01 to current/open; source msha-controller-operator-history