# Relationship history for MSHA mine 1001890

Current hierarchy: **Gunn Barry A → Barry A Gunn Construction Inc → Gunn Portable Plant**

- 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

- **operator_operates_mine:** Barry A Gunn Construction Inc → Gunn Portable Plant; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gunn Barry A → Gunn Portable Plant; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gunn Barry A → Barry A Gunn Construction Inc; 1993-07-01 to current/open; source msha-controller-operator-history