# Relationship history for MSHA mine 4703517

Current hierarchy: **Tony J  Rihn → Tony Rihn Crushing → Tony's Crusher**

- 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

- **operator_operates_mine:** Tony Rihn Crushing → Tony's Crusher; 2007-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tony J  Rihn → Tony's Crusher; 2007-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony J  Rihn → Tony Rihn Crushing; 2007-10-22 to current/open; source msha-controller-operator-history