# Relationship history for MSHA mine 2501261

Current hierarchy: **Michelle R Wolinski EtAl; Derek A Wolinski EtAl → Tri County Sand & Gravel, Inc. → Plant #2**

- 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:** Kyle R  Wolinski → Plant #2; 1980-02-01 to 2019-12-24; source msha-controller-operator-history
- **operator_operates_mine:** Tri County Sand & Gravel, Inc. → Plant #2; 2009-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kyle R  Wolinski → Tri County Sand & Gravel, Inc.; 2009-09-15 to 2019-12-24; source msha-controller-operator-history
- **controller_controls_mine:** Michelle R Wolinski EtAl → Plant #2; 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
- **controller_controls_operator:** Derek A Wolinski EtAl → Tri County Sand & Gravel, Inc.; 2019-12-25 to current/open; source msha-controller-operator-history