# Relationship history for MSHA mine 3003845

Current hierarchy: **Justin  Sokolowski → Seward Sand & Gravel Inc. → Rathbun 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

- **controller_controls_mine:** David R  Beisler → Rathbun Pit; 1983-04-14 to 2022-11-30; source msha-controller-operator-history
- **controller_controls_mine:** David E  Parker → Rathbun Pit; 2009-05-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Parker Excavating & Gravel Co Inc → Rathbun Pit; 2012-04-19 to 2012-08-09; source msha-controller-operator-history
- **controller_controls_operator:** David E  Parker → Parker Excavating & Gravel Co Inc; 2012-04-19 to 2012-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Seward Sand & Gravel Inc. → Rathbun Pit; 2012-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David R  Beisler → Seward Sand & Gravel Inc.; 2012-08-10 to 2022-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Justin  Sokolowski → Rathbun Pit; 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