# Relationship history for MSHA mine 4503236

Current hierarchy: **Scott A  De Rosier → De Rosier Trucking Inc → Pleasant Hill Pit**

- 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

- **operator_operates_mine:** De Rosier Trucking Inc → Pleasant Hill Pit; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott A  De Rosier → Pleasant Hill Pit; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott A  De Rosier → De Rosier Trucking Inc; 1991-05-01 to current/open; source msha-controller-operator-history