# Relationship history for MSHA mine 1513755

Current hierarchy: **Delford B  Endicott → Rainbow Mining Corp → No 4**

- 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

- **controller_controls_mine:** Delford B  Endicott et al → No 4; 1981-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rainbow Mining Corp → No 4; 1982-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delford B  Endicott et al → Rainbow Mining Corp; 1982-10-01 to current/open; source msha-controller-operator-history