# Relationship history for MSHA mine 4103950

Current hierarchy: **Erath County-Tx → Erath County → PORTABLE #4**

- 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

- **controller_controls_mine:** Erath County-Tx → PORTABLE #4; 1995-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Erath County → PORTABLE #4; 1997-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Erath County-Tx → Erath County; 1997-06-01 to current/open; source msha-controller-operator-history