# Relationship history for MSHA mine 4102504

Current hierarchy: **F M  Young → Young Brothers Inc Contractors → Lake Brazos Dredge And Plant**

- 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:** Young Brothers Inc Contractors → Lake Brazos Dredge And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** F M  Young → Lake Brazos Dredge And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** F M  Young → Young Brothers Inc Contractors; 1950-01-01 to current/open; source msha-controller-operator-history