# Relationship history for MSHA mine 3004020

Current hierarchy: **William H  Barney → William Barney Construction Inc. → Pegson 428 Trakpactor Impact Jaw 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** William H  Barney → Pegson 428 Trakpactor Impact Jaw Crusher; 2012-06-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** William Barney Construction Inc. → Pegson 428 Trakpactor Impact Jaw Crusher; 2018-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William H  Barney → William Barney Construction Inc.; 2018-08-10 to current/open; source msha-controller-operator-history