# Relationship history for MSHA mine 2601853

Current hierarchy: **Widham Ralph → All American Aggregates → Desert Mtn Pit & Mill**

- 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:** Dennis Ponte Inc → Desert Mtn Pit & Mill; 1983-07-01 to 1984-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Ponte Dennis → Desert Mtn Pit & Mill; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ponte Dennis → Dennis Ponte Inc; 1983-07-01 to 1984-08-22; source msha-controller-operator-history
- **operator_operates_mine:** All American Aggregates → Desert Mtn Pit & Mill; 1984-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Widham Ralph → Desert Mtn Pit & Mill; 1984-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Widham Ralph → All American Aggregates; 1984-08-23 to current/open; source msha-controller-operator-history