# Relationship history for MSHA mine 4103719

Current hierarchy: **Washington County-Tx → Washington County Road & Bridge → HARMEL PIT SOUTH**

- 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:** Washington County Road & Bridge → HARMEL PIT SOUTH; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Washington County-Tx → HARMEL PIT SOUTH; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Washington County-Tx → Washington County Road & Bridge; 1992-04-01 to current/open; source msha-controller-operator-history