# Relationship history for MSHA mine 4406523

Current hierarchy: **Rasch Robert P → Rpr Inc → #1 Strip & Auger**

- 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:** W D Equipment Rental Inc → #1 Strip & Auger; 1989-07-01 to 1990-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Dennis Wayne George → #1 Strip & Auger; 1989-07-01 to 1990-08-28; source msha-controller-operator-history
- **controller_controls_operator:** Dennis Wayne George → W D Equipment Rental Inc; 1989-07-01 to 1990-08-28; source msha-controller-operator-history
- **operator_operates_mine:** Blue Bird Mining Inc → #1 Strip & Auger; 1990-08-29 to 1993-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Litton L E Jr → #1 Strip & Auger; 1990-08-29 to 1993-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Litton L E Jr → Blue Bird Mining Inc; 1990-08-29 to 1993-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Rpr Inc → #1 Strip & Auger; 1993-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rasch Robert P → #1 Strip & Auger; 1993-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rasch Robert P → Rpr Inc; 1993-02-02 to current/open; source msha-controller-operator-history