# Relationship history for MSHA mine 4406664

Current hierarchy: **Rasch Robert P → Rpr Inc → #2 Surface**

- 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:** White Mountain Coal Company Inc → #2 Surface; 1991-09-01 to 1993-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Hylton Alton D → #2 Surface; 1991-09-01 to 1993-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Hylton Alton D → White Mountain Coal Company Inc; 1991-09-01 to 1993-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Rasch Robert P → #2 Surface; 1993-02-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rpr Inc → #2 Surface; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rasch Robert P → Rpr Inc; 1993-06-01 to current/open; source msha-controller-operator-history