# Relationship history for MSHA mine 3609738

Current hierarchy: **Ryan L Ruark → Ryan Ruark → Clapper Quarry**

- 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:** Ryan Ruark → Clapper Quarry; 2009-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ryan L Ruark → Clapper Quarry; 2009-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan L Ruark → Ryan Ruark; 2009-04-13 to current/open; source msha-controller-operator-history