# Relationship history for MSHA mine 4300680

Current hierarchy: **Quinn L  Benjamin → Benjamin Stone Works → Benjamin Stone Works**

- 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:** Benjamin Stone Works → Benjamin Stone Works; 2007-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quinn L  Benjamin → Benjamin Stone Works; 2007-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quinn L  Benjamin → Benjamin Stone Works; 2007-09-11 to current/open; source msha-controller-operator-history