# Relationship history for MSHA mine 1505359

Current hierarchy: **Guterma A L → Mt Victory Coal Company → Victory Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mt Victory Coal Company → Victory Mine; 1972-01-01 to 1976-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Brown Layton Jr → Victory Mine; 1972-01-01 to 1976-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Brown Layton Jr → Mt Victory Coal Company; 1972-01-01 to 1976-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Mt Victory Coal Company → Victory Mine; 1976-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Guterma A L → Victory Mine; 1976-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Guterma A L → Mt Victory Coal Company; 1976-01-08 to current/open; source msha-controller-operator-history