# Relationship history for MSHA mine 4105392

Current hierarchy: **Ken  Eubanks → Tubb Quarry, LLC → TQ Porta Crush**

- 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

- **controller_controls_mine:** Ken  Eubanks → TQ Porta Crush; 2014-01-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tubb Quarry, LLC → TQ Porta Crush; 2018-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Eubanks → Tubb Quarry, LLC; 2018-09-04 to current/open; source msha-controller-operator-history