# Relationship history for MSHA mine 3503867

Current hierarchy: **Tanner  Brown; Sean  Brown → Greenbar Excavation, L.L.C. → Dry Creek Aggregate**

- 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:** Richard Bartels Construction, L.L.C. → Dry Creek Aggregate; 2018-03-20 to 2021-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Bartels → Dry Creek Aggregate; 2018-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Bartels → Richard Bartels Construction, L.L.C.; 2018-03-20 to 2021-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Greenbar Excavation, L.L.C. → Dry Creek Aggregate; 2021-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tanner  Brown et al → Dry Creek Aggregate; 2021-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tanner  Brown et al → Greenbar Excavation, L.L.C.; 2021-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sean  Brown et al → Greenbar Excavation, L.L.C.; 2021-05-26 to current/open; source msha-controller-operator-history