# Relationship history for MSHA mine 0405167

Current hierarchy: **Ponte Dennis → Dennis Ponte Inc → Dennis Ponte Incorporated Portable**

- 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:** Ponte Dennis → Dennis Ponte Incorporated Portable; 1983-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dennis Ponte Inc → Dennis Ponte Incorporated Portable; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ponte Dennis → Dennis Ponte Inc; 1992-01-01 to current/open; source msha-controller-operator-history