# Relationship history for MSHA mine 1601427

Current hierarchy: **Thomas E  Johnson → Johnson Rock Company Incorporated → Longhorn Lease**

- 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:** Johnson Rock Company Incorporated → Longhorn Lease; 2005-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Johnson → Longhorn Lease; 2005-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Johnson → Johnson Rock Company Incorporated; 2005-11-04 to current/open; source msha-controller-operator-history