# Relationship history for MSHA mine 3605828

Current hierarchy: **David D  Osikowicz Jr → Original Fuels Inc → Yenzi Strip #3 Mine**

- 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:** John R Yenzi Jr → Yenzi Strip #3 Mine; 1975-04-01 to 2010-02-28; source msha-controller-operator-history
- **controller_controls_mine:** John R  Yenzi Jr → Yenzi Strip #3 Mine; 1975-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Yenzi Jr → John R Yenzi Jr; 1975-04-01 to 2010-02-28; source msha-controller-operator-history
- **controller_controls_mine:** David D  Osikowicz Jr → Yenzi Strip #3 Mine; 1984-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leonard  Yenzi → Yenzi Strip #3 Mine; 1989-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leonard W. Yenzi Company → Yenzi Strip #3 Mine; 2010-03-01 to 2017-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Yenzi → Leonard W. Yenzi Company; 2010-03-01 to 2017-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Original Fuels Inc → Yenzi Strip #3 Mine; 2017-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David D  Osikowicz Jr → Original Fuels Inc; 2017-09-27 to current/open; source msha-controller-operator-history