# Relationship history for MSHA mine 3003953

Current hierarchy: **Justin  Sokolowski → SEWARD SAND & GRAVEL INC. → METSO ST3.5   SERIAL # 78177**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** David R  Beisler → METSO ST3.5   SERIAL # 78177; 1983-04-14 to 2022-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Seward Sand & Gravel Inc. → METSO ST3.5   SERIAL # 78177; 2015-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David R  Beisler → Seward Sand & Gravel Inc.; 2015-06-25 to 2022-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Justin  Sokolowski → METSO ST3.5   SERIAL # 78177; 2022-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin  Sokolowski → Seward Sand & Gravel Inc.; 2022-12-01 to current/open; source msha-controller-operator-history