# Relationship history for MSHA mine 1517123

Current hierarchy: **Niece Donald → Double N Corp → Mine #1**

- 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:** Double N Corp → Mine #1; 1991-09-01 to 1993-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Niece Wilford → Mine #1; 1991-09-01 to 1993-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Niece Wilford → Double N Corp; 1991-09-01 to 1993-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Double N Corp → Mine #1; 1993-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Niece Donald → Mine #1; 1993-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Niece Donald → Double N Corp; 1993-12-01 to current/open; source msha-controller-operator-history