# Relationship history for MSHA mine 1512529

Current hierarchy: **Jessup T K → T K Jessup Inc → Rough Creek**

- 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:** Jessup T K → Rough Creek; 1974-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T K Jessup Inc → Rough Creek; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jessup T K → T K Jessup Inc; 1980-09-01 to current/open; source msha-controller-operator-history