# Relationship history for MSHA mine 4003066

Current hierarchy: **Onyx International Inc & Coalfield Consultants Inc → West Prg 1 Inc → West Prg Mine #2**

- 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:** Onyx International Inc & Coalfield Consultants Inc → West Prg Mine #2; 1992-02-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Prg 1 Inc → West Prg Mine #2; 1992-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Onyx International Inc & Coalfield Consultants Inc → West Prg 1 Inc; 1992-11-01 to current/open; source msha-controller-operator-history