# Relationship history for MSHA mine 2900249

Current hierarchy: **Chris  Mendius; Steven B Garnett; Todd E Kokes → Silbrico Corp → Uniperl Or Uniperl Division**

- 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:** Silbrico Corp → Uniperl Or Uniperl Division; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mendius Carl Jr → Uniperl Or Uniperl Division; 1950-01-01 to 2024-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Mendius Carl Jr → Silbrico Corp; 1950-01-01 to 2024-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Steven B Garnett et al → Uniperl Or Uniperl Division; 2024-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven B Garnett et al → Silbrico Corp; 2024-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Mendius et al → Silbrico Corp; 2024-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd E Kokes et al → Silbrico Corp; 2024-10-09 to current/open; source msha-controller-operator-history