# Relationship history for MSHA mine 4202029

Current hierarchy: **Burchette Jim → Burchett & Good Contractors Inc → B & G Portable Crusher**

- 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:** Burchett & Good Contractors Inc → B & G Portable Crusher; 1988-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burchette Jim → B & G Portable Crusher; 1988-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burchette Jim → Burchett & Good Contractors Inc; 1988-07-01 to current/open; source msha-controller-operator-history