# Relationship history for MSHA mine 3003012

Current hierarchy: **Douglas R  Rushford → Douglas R Rushford Trucking → SHINGLE STREET 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

- **controller_controls_mine:** Douglas R  Rushford → SHINGLE STREET PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Douglas R Rushford Trucking → SHINGLE STREET PIT; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas R  Rushford → Douglas R Rushford Trucking; 1991-06-01 to current/open; source msha-controller-operator-history