# Relationship history for MSHA mine 2500945

Current hierarchy: **Michelle R Wolinski EtAl; Derek A Wolinski EtAl → Tri-County Sand & Gravel Inc → H R Hansen Pit**

- 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:** Tri-County Sand & Gravel Inc → H R Hansen Pit; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kyle R  Wolinski → H R Hansen Pit; 1980-02-01 to 2019-12-24; source msha-controller-operator-history
- **controller_controls_operator:** Kyle R  Wolinski → Tri-County Sand & Gravel Inc; 1980-02-01 to 2019-12-24; source msha-controller-operator-history
- **controller_controls_mine:** Derek A Wolinski EtAl → H R Hansen Pit; 2019-12-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derek A Wolinski EtAl → Tri-County Sand & Gravel Inc; 2019-12-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michelle R Wolinski EtAl → Tri-County Sand & Gravel Inc; 2019-12-25 to current/open; source msha-controller-operator-history