# Relationship history for MSHA mine 1601060

Current hierarchy: **Roy E  Young Jr → Acadiana Shell & Limestone Inc → ROY YOUNG SAND PIT**

- 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:** Acadiana Shell & Limestone Inc → ROY YOUNG SAND PIT; 1985-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy E  Young Jr → ROY YOUNG SAND PIT; 1985-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy E  Young Jr → Acadiana Shell & Limestone Inc; 1985-06-01 to current/open; source msha-controller-operator-history