# Relationship history for MSHA mine 4202785

Current hierarchy: **Michael  Roundy; Troy L Pearson → Barco LLC. → Barco portable crusher 1**

- 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:** Barco LLC. → Barco portable crusher 1; 2025-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy L Pearson et al → Barco portable crusher 1; 2025-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy L Pearson et al → Barco LLC.; 2025-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Roundy et al → Barco LLC.; 2025-05-04 to current/open; source msha-controller-operator-history